How to understand that the firmware on Android has failed. Recovering data on Android after a factory reset
Android platform most common among mobile device users. It is quite stable, but there are still a number of factors that can affect the performance of gadgets. In particular, a common problem for tablets is firmware crashes. This serious violation, so it’s worth understanding its causes and consequences. Experts from the Kabanchik.ua service shared information about this.
Causes of problems with firmware
The firmware in Android devices usually crashes due to:
- damage to the device by a virus program;
- independent attempts at flashing;
- using “homemade” firmware;
- violations with root access (this is the main administrator mode);
- interrupted wireless update;
- accumulated over long-term use of system errors.
In almost all cases, tablet repair is needed, the price of which depends on the source of the problem. Great importance has the choice of a master: it is better to contact direct specialists who have reviews and a portfolio.
Signs that the firmware has failed
The main “symptom” is partial or complete loss of functionality. For example, the tablet stops responding to any commands given through the screen or buttons. Another indicator - information window about problems with RAM gadget. The fact that the firmware has crashed is also indicated by an error when turning it on, indicating that further downloading of Android is impossible. Well, the most common symptom is that the tablet does not turn on or “comes to life” for 2 seconds before turning off again.
How to restore factory firmware?
This is possible if the tablet still turns on, partially functions, but constantly displays error messages or freezes, does not load completely, and partially does not respond to touches.
The solution to the problem is to find the original factory firmware (usually it is posted on the official website by the manufacturer, if it is not a Chinese “noname”). You need to install new firmware by connecting the device to your computer. This is enough for a specialist simple task. Therefore, it is better to contact a specialist who repairs mobile phones and order a service from him, making sure of the proper level of professionalism. The work will take a little time.
Rollback firmware to previous version
The easiest way to update a partially damaged firmware on Android is to roll it back to a backup copy made in advance. It is best to make such copies each time before installation. unknown applications. They will help you make backups special programs. You can consult with a specialist who is well versed in specific device to select the best app for you.
How to solve the problem reliably and inexpensively?
If, for one reason or another, using the two listed methods does not work, you definitely need to contact a specialist without performing any additional actions. To save on repairs mobile device, it is best to find a specialist without intermediaries.
The Kabanchik.ua service will help with this: just fill out the task, and in just 5 minutes you can choose a proven specialist with reviews, portfolio and rating. In addition, the customer himself sets the price and time frame for restoring the firmware. But in order to prevent repeated problems with the firmware, it is better to install a good anti virus program, do not allow the installation of unverified applications, do not use administrator rights without understanding the processes, and install updates only with a stable Internet connection.
Other news
Sometimes after an unsuccessful update, installation of an application with a virus, or unofficial firmware of the device, the gadget begins to malfunction. In particularly difficult cases, you can remove both the firmware and the bootloader, then the smartphone will not be able to boot the system at all or reset the settings to factory settings. Let us describe simple and effective ways, which can help restore the firmware on Android.
Reflash the phone using a PC
If Android crashes completely, you need to flash the operating system. For now, we’ll tell you how to return the factory version using the example of Samsung gadgets. There are quite official way updates using software Kies.
Flashing procedure:
There will also be a recovery code here, which you can copy into the appropriate field. To start the process, just click on the “Restore” button.
If the code recovery program I didn’t offer it, it won’t be possible to do a flashing.
A universal way to flash Samsung using Odin
The Odin program works under Windows with all Samsung devices. All data is destroyed after flashing, so it is necessary to back it up before doing this.
Preparation:
After this you can do a flashing. To do this, first launch Odin on your PC and transfer your device from Android to Recovery mode. On Samsung devices it is usually launched as follows:
- turn off the device;
- press and hold at the same time Home buttons, "-" and Power;
- then the “+” button once.
After the device switches to Recovery Mode connect it with a USB cable to your PC. Further:
All you have to do is wait for completion, after which the device will reboot. Next you will need to do the standard procedures - return old account etc.
Restoring the firmware of LG devices
Ways to remove old version and update the firmware via a computer are largely universal. You can see this using the example of another LG device. To restore the latest factory firmware:
Unofficial LG flashing
If problems with your phone do not allow you to do official flashing, then you can resort to using unofficial ways. For Samsung, as we noted earlier, this Odin program, for LG - KDZ Updater, for HTC - Android SDK Platform Tools.
Using LG as an example, let's look at how to flash the firmware if Android crashes: 
- Download and unzip the archive on KDZ Updater in system partition your disk;
- Go to the application folder and run the msxml.msi installation;
- For your device model, download the firmware from the Internet at http://lg-phone-firmware.com/, during which time recharge the device by at least 50%;
- Launch KDZ Updater;
- Connect the device using a USB cable, wait until the USB drivers are installed on the PC;
- Make sure that USB debugging is enabled on your smartphone (Settings section, “For Developers” folder);
- Turn off the device and disconnect the cable from the PC;
- Next, you will need to remove the battery (this is not required for all models), press and hold the Volume Down button, and reconnect the gadget to the PC using the USB cable;
- The display will show S/W Upgrade;
- In Device Manager, Computer folder, disable LG Mobile USB Modem;
- Go to the folder with the firmware application and run the KDZ_FW_UPD.exe file as administrator;
- In the program in the drop-down Type list open 3GCQT;
- In the PhoneMode field, specify the DIAG parameter;
- In KDZ File, specify the path to the previously downloaded firmware;
- The process is started by clicking on Launch software Update; during flashing, the smartphone may reboot several times.
As you can see, the old Android OS can be returned in a way that is standard for all manufacturers. Using non-original flashing tools is not always easy, and this process carries the risk of turning the device into a “brick.” However, in some situations, only this method can help cope with complex problems systems of your gadget.
If your gadget on the Android platform stops turning on, it means that you performed some action that led to such problems. You may have installed a conflicting application or a virus program, incorrectly updated the device, obtained Root rights, or deleted, changed system files. There could be a lot of reasons, and right now it’s not so important to us why this happened. In this article, we will solve the problem of a mobile gadget not turning on on the Android operating system using new firmware.
Solution
If everything is fine with the bootloader, there is nothing difficult in solving the problem. But first you need to make sure that this is so. Click on “Power” and watch the screen react. If everything is fine with the bootloader, you will see an exclamation mark on the screen, Android or a lying robot. If there is a reaction, it's all in the operating system, which means that new firmware will solve the problem.If you don’t see anything on the screen, connect your smartphone or tablet to the computer and press “Power” or the combination Power + volume button (down). The computer should see that mobile gadget connects to it. In this case, there is also a chance to update the software.
Restoring using the manufacturer's program
The easiest way to restore a device that won't turn on is to download the utility for installing drivers and updating the OS on the manufacturer's official website. This option is not suitable for all models of smartphones and tablets. But if your device is made by LG, do the following:
If custom Recovery CWM is installed
There is another opportunity to update the software for a “dead” Android. But in order to use it, you must have access to Recovery. To open the special mode, press the “Power” and “Volume -” keys at the same time.If Recovery starts on the device, do the following:
Through a custom application for Windows for firmware
You can also use an unofficial program. Follow the instructions to install the software.
Execution steps
- Download the program (flasher) to your PC.
- Download the firmware for your device.
- Connect the device to the PC and click “Power” + “Vol –”.
- Select the file from Android using the utility and install.
Hello dear readers! This time I want to tell you about what to do if the firmware on your smartphone has crashed. Of course, many already know what to do in such situations, but there are also newcomers to this matter! Nowadays, you won’t surprise anyone with a smartphone that copes with its responsibilities quite normally personal computer. HD viewing and...
Hello dear readers! This time I want to tell you about what to do if the firmware on your smartphone has crashed. Many, of course, already know what to do in such situations, but there are also newcomers to this matter! Nowadays, you won’t surprise anyone with a smartphone that copes quite well with the duties of a personal computer. Watching HD and even FullHD videos, playing demanding games, using all kinds of interfaces (Wi-Fi, Bluetoth, etc.), even non-top smartphone models can cope with these tasks.
But sometimes it happens that a beginner can turn his smartphone into a “brick” unintentionally. It's either not correct independent firmware device, or discharging the device “to zero”... Yes, yes, discharging the device “to zero” can also damage it. For example, at Lenovo tablet IdeaTab present this problem, after discharging to zero percent, the tablet refuses to charge and turn on! In this case, flashing a certain fix helps...
Flash memory, graphics accelerator, processor, all sorts of modules - this is what it consists of modern smartphone. It is in the flash memory (built-in memory of the smartphone) that the firmware files and hardware settings are located.
Random device shutdowns and freezes, spontaneous shutdown Bluetooth interfaces and Wi-Fi are all signs of future firmware problems. In most cases, the question “how to flash a smartphone?” or “what to do if the firmware crashes?” occurs after the smartphone begins to become “stupid” (interface lag, etc.). In addition, problems with the firmware may begin after independent attempts to install custom firmware or flash the kernel or radio module! And now, after the smartphone either does not turn on or does not load beyond the loading screen, the question arises, what to do if the firmware has crashed?
Of course, all smartphones have different firmware algorithms, but I will try to give you some general tips that are suitable for a smartphone from any manufacturer.
What to do if the firmware has crashed?
First thing, it’s worth reading the instructions for flashing your device’s firmware on specialized forums. One of the most famous is the 4pda.ru forum. On this forum you can find information about any device from any manufacturer.
Secondly, before you start flashing the device, you need a cable to connect your smartphone to your computer, a new firmware version for your smartphone, special utility for your device, which will allow you to flash new version firmware.
I would like to emphasize that when flashing the device firmware, all data on your smartphone will be erased: photos/videos, music, etc. So what to do backup copy your smartphone data.
Third, the firmware process may take a long time. Read the instructions carefully and follow all the points; this is not the case when amateur performance is appropriate. It is advisable that the smartphone charge be at least 50% before starting the firmware. Because an unfinished firmware process can easily turn your device into a “creepy” one. And after such a state, there is only one way - to the authorized service center!
Well, that's all... It makes no sense to describe the firmware process in detail, since I already said above, each smartphone has its own firmware algorithm. This material is more aimed at beginners who are wondering “what to do if the Android firmware?”, and for GICs – this material is just a reminder of simple rules!
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Most of the articles in the X-Mobile section are devoted to hacks and tweaks that require obtaining root rights, modifying the firmware or replacing it with a custom one. However, not every reader is ready to subject their smartphone to such operations, fearing that they can turn the device into a brick or lead to instability in operation. Today I will debunk these myths and show that even in the most stalemate situation, bringing a smartphone back to life is not so difficult.
Destroying myths
Let's talk about what it really means to “turn a smartphone into a brick” and what other pitfalls can await the user on the way to changing the system and installing custom firmware. What glitches can be caught in this case and is it possible to kill a smartphone by reflashing it incorrectly? Will you lose the warranty forever or can the smartphone be returned to its previous condition? Can custom firmware really let a smartphone owner down? inopportune moment and are they worth it?
Myth 1. Incorrect flashing can kill a smartphone
A fall from the fifth floor can kill a smartphone, but not flashing it. The main problem that anyone who wants to reflash a smartphone faces is that during the installation of the firmware, a failure may occur, which will lead to its inoperability, and the smartphone will actually turn into a brick.
All this is true, but only on paper. To understand why, it’s enough to understand how the process of flashing a smartphone works and what system components are used in this case. To be able to install third-party firmware on a smartphone, you need to unlock the bootloader (not in all cases), get root and install a custom recovery console (ClockworkMod or TWRP), capable of installing firmware with any digital signature.
The Recovery Console is stored in separate section internal NAND memory and is in no way related to the installed operating system. After installing a modified version of the console, it will be possible to flash custom firmware or even another OS (Firefox OS, for example). If a failure occurs during the installation of the firmware, the smartphone will not be able to boot it, but the recovery console will remain in place, and all you need to do is boot into recovery again and reinstall the firmware.
In addition, any custom recovery console contains a backup/restore function, which allows you to make a backup copy of the main firmware and restore it unchanged (with all applications, settings and data) in the event that something goes wrong. In fact, the smartphone can be returned to its original state.
You may ask: what happens if the installation of the Recovery Console itself fails? Nothing, in this case the opposite situation will turn out when operating system will remain in place, and the console will be lost. To deal with it, you just need to re-flash recovery directly from Android.
Hypothetically, one can imagine a situation where both the firmware and the recovery console are killed (although this is quite difficult to do), but even in this case the primary bootloader, flashed in permanent memory smartphone.
Conclusion: kill your smartphone by installing third party firmware through a custom recovery console, impossible. Either the recovery or the primary bootloader will always remain in place.
Myth 2. Custom firmware is unreliable
Firmware is different from firmware. In the vastness world wide web can be found great amount Android assemblies for every taste and color, and most of them are really slag, which can lead to instability in the operation of the smartphone and loss of some functionality. Therefore, the first thing to remember is that you should only deal with serious custom firmware developed by large teams of experienced developers. First of all, these are CyanogenMod, Paranoid Android, AOKP, OmniROM and MIUI.
Second. There are two types of firmware: officially supported and ported third party developers. The same CyanogenMod, for example, has official version for the Nexus 4 smartphone, but does not have one for the Motorola Defy. But for Defy there is an unofficial port of CyanogenMod 11 from a developer with the nickname Quarx. The difference between them is that the CyanogenMod team is responsible for the support and proper operation of the first, while the second is Quarx personally. Official firmware versions are usually fully functional, but the correct operation of the latter depends on the third-party developer.
Well, third. There are stable and development versions of the firmware. Stable versions CyanogenMod have the index M (CyanogenMod 11.0 M7, for example). This firmware version usually does not contain bugs. Development versions (in the case of CyanogenMod these are daily nightly builds) may contain bugs and are therefore not recommended for everyday use.
Conclusion: if you install a stable official version of the “normal” firmware on your smartphone, the risk of encountering bugs is minimal. Everything else is for experimenters.
Myth 3. Software that requires root rights can brick a smartphone
In theory, an application with root rights can do anything with the smartphone's firmware, including erasing it completely. Therefore, you need to be extremely careful with such software. The software we talk about on the pages of the magazine is completely safe and tested in our own skin. In addition, for all the time I have been using smartphones on Android (and this is starting from version 1.5), I never I haven’t encountered a situation where software with root support killed a smartphone.
Software distributed through Google Play, usually fully corresponds to the stated characteristics, and if it led to a brick or left a backdoor in the depths of the smartphone, it would not last even a week in the store. In any case, here you need to follow the “trust but verify” rule and carefully read the instructions for using root applications.
Myth 4. Root rights make a smartphone vulnerable to viruses
What makes a smartphone vulnerable to viruses is not root rights, but the bugs used to obtain them. Rooting tools and viruses can use the same Android vulnerabilities to obtain root rights, so the fact itself presence of root does not change anything on the device. A well-written virus will not ask for permissions in a standard way, giving away his presence, he will instead take advantage of the same vulnerability to obtain them covertly.
Moreover, having root, you get the opportunity to install the latest Android version(in the form of custom firmware), in which these bugs have already been fixed. Also, do not forget that most custom firmware allows you to disable root or create white lists of applications that can use these rights.
Myth 5. A rooted smartphone may fail
Software designed to obtain root does four simple things: launches an exploit that allows you to gain root rights in the system, mounts the /system partition in write mode, copies the su binary required to obtain root rights in the future to the /system/xbin directory, and installs the SuperSU or SuperUser application, which will take control whenever any application requests root privileges using su.
None of these steps can crash or kill the smartphone. The only thing that can happen is that the exploit will cause a segmentation fault and the smartphone will reboot, after which it will continue to work normally.
Myth 6. By getting root and installing custom firmware, I will lose the warranty
The guarantee is lost not from the fact of obtaining root, but due to its detection by the service center. Most devices can be unrooted using the Universal Unroot app or by reinstalling the stock firmware using official application from the manufacturer.
There are, however, two exceptions to this rule. The first is the Knox system, pre-installed on new smartphones and samsung tablets, such as Galaxy S4, S5, Note 3 and Note 10.1. Knox delivers an elevated level Android security, responding to any firmware modifications and installation of third-party kernels and firmware. If the user performs these actions, the system sets a trigger that confirms the fact of the modification. The trigger is implemented in hardware (eFuse chip), so it cannot be reset to its initial position. On the other hand, it is not entirely clear whether the service center will refuse to repair the device on this basis. Second: the eFuse chip is installed on some other devices (for example, smartphones from LG), and it also allows you to accurately determine whether the smartphone has been rooted or flashed.
If we talk about custom firmware, everything is more complicated. Typically, the flashing operation requires unlocking the bootloader, and this can be done either using special exploits or using the smartphone manufacturer's web service. In any case, the unlocked bootloader will definitely indicate that the smartphone did not belong to a blonde.
On some smartphones, it is possible to lock the bootloader back, but you should learn about this separately, and also keep in mind that the newly locked bootloader will most likely receive the status Re-locked, and not Locked, as it was originally (this happens on HTC smartphones, For example). The only exceptions here are smartphones and tablets of the Nexus line, the bootloader of which can be locked and unlocked in three clicks without any dancing with a tambourine, and no one will find fault with anything.
INFO
On Linux, ADB and Fastboot can be installed separately from the Android SDK. On Ubuntu: sudo apt-get install android-tools-fastboot. On Fedora: sudo yum install android-tools.
To prevent Knox from interfering with root applications, you can disable it using next command from the terminal: su pm disable com.sec.knox.seandroid.
conclusions
Getting root and flashing a smartphone are absolutely safe operations that cannot completely destroy the smartphone. technical reasons. The only exception is an attempt to hack the bootloader in order to unlock it. In this case, the eFuse chip (if the smartphone has one) may work and block the ability to turn on the smartphone.
Fortunately, today smartphone manufacturers either prefer not to block the ability to turn on a smartphone with a hacked bootloader (by setting a trigger indicating the fact of such an action, as Knox does), or implement a special web service that allows you to painlessly unlock the bootloader with loss of warranty on the smartphone. which saves users from having to risk breaking the bootloader.
Problems that may arise during flashing
So, now let's talk about what problems can arise when getting root and flashing and how to deal with them.
Scenario one: after an unsuccessful flashing, the smartphone stopped booting
Unsuccessful flashing can be caused by several factors: the battery died and the firmware was only half filled; the firmware turned out to be faulty or intended for a different smartphone model. In the end, there was simply not enough space on the smartphone, which can happen when trying to install the latest version of Android on a smartphone that is three or four years old.
Outwardly, all these problems usually manifest themselves either in endless resets of the smartphone to the initial manufacturer logo, or in the so-called boot loop, when the boot animation plays on the screen for more than five to ten minutes. There may also be problems with the screen (multi-colored ripples) and a non-working touch screen, which also prevent the use of the smartphone.
In all these cases, it is enough to do one simple thing: turn off the smartphone by long pressing the power button, then turn it on while holding down the volume down button (some smartphones use a different combination), and after you get into recovery, reinstall the firmware (Install zip from sdcard -> Chooze zip from sdcard) or restore the backup ( Backup and restore -> Restore). Everything is easy and simple.
Scenario two: the firmware works, but recovery is not available
This can happen after a failed installation or update of the Recovery Console. The problem is that after rebooting the smartphone and turning it on while holding down the volume down button, a black screen appears, after which the smartphone either resets or freezes.
Solving this problem is not easy, but very simple. You can install the recovery console on the vast majority of smartphones using TWRP applications Manager ROM Manager or ROM Installer. They themselves determine the smartphone model, download and flash the required recovery, without requiring a reboot. If you can’t restore the console with their help, just find instructions on the Internet for recovery installation to your device.
Scenario three: neither firmware nor recovery is available
To be honest, it is difficult for me to imagine such a scenario, but, as practice confirms, it is quite real. There are two ways to get out of this situation: use fastboot to upload recovery to your smartphone, or use a tool from the manufacturer to install stock firmware. We'll look at the second method in more detail in the next section, and I'll talk about fastboot here.
Fastboot is a tool that works directly with the device’s primary bootloader and allows you to upload firmware to your smartphone, recovery, and unlock the bootloader (in Nexus devices). Fastboot support is available in many smartphones and tablets, but some manufacturers block the ability to use it. So you will have to consult the Internet about its availability.
To access fastboot, you will need drivers and the Android SDK. When they are installed, open command line, go to the directory SDK installation, then to the platform-tools directory, turn off the smartphone, turn it on with the volume buttons pressed (both) and connect it using a USB cable to the PC. Next you need to find recovery image in .img format for your device and run the command:
$ fastboot flash recovery image.img
Or even force the smartphone to boot recovery without actually installing it:
$ fastboot boot image.img
In the same way you can flash official firmware update:
$ fastboot update update-file.zip
You can find a recovery suitable for your device either on the TWRP website or in the XDA-Developers and 4PDA forums.
We return the smartphone to its original state
In this section, I will talk about ways to return your smartphone to clean stock, no matter what state it is in. These instructions can be used both to unbrick your smartphone and to remove traces of rooting and flashing. Unfortunately, I can’t talk about all possible models, so I’ll focus on the four most popular flagships: Nexus 5 (I call this sample the control one), Galaxy S5, LG G2 and Sony Xperia Z2.
Nexus 5 and other Google phones
Restoring Nexus devices to their original state is easier than any other smartphone or tablet. In fact, it is so simple that there is not even anything to talk about. In fact, all you need to do is install the ADB/fastboot drivers (on Linux you don’t even need them), download the archive with the firmware and run the script. The whole operation looks like this step by step:
- from here.
- Download and install Android SDK.
- Download the archive with the firmware for the desired device from the Google website.
- Turn off the device, turn it on with the volume buttons pressed (both) and connect using a USB cable.
- Unpack the archive with the firmware and run the flash-all.bat (Windows) or flash-all.sh (Linux) script and wait for the operation to complete.
- We launch the command line, go to the directory with the Android SDK, then platfrom-tools and execute the fastboot oem lock command to lock the bootloader.
For those who are interested in what the script does, here is a list of commands:
Fastboot flash bootloader bootloader-DEVICE-NAME-VERSION.img fastboot reboot-bootloader fastboot flash radio radio-DEVICE-NAME-VERSION.img fastboot reboot-bootloader fastboot flash system system.img fastboot reboot-bootloader fastboot flash userdata userdata.img fastboot flash recovery recovery.img fastboot flash boot boot.img fastboot erase cache fastboot flash cache cache.img
Galaxy S5
Co Galaxy smartphone S5 is a little more complicated, but overall quite simple. This time you will need the Samsung Odin application, which will be used to flash the smartphone’s firmware. Sequencing:
- Download and install latest version Samsung USB drivers from here.
- Download and install the latest version of Odin from here.
- Go to the website samfirmware.com, enter the SM-G900F model in the search, find the firmware marked Russia, download and unpack.
- Turn off the smartphone and turn it on with the Volume Down and Home buttons pressed, wait five seconds until a warning message appears.
- Press the volume up button to put the smartphone into Odin mode.
- We connect the smartphone using a USB cable.
- Launch Odin, press the PDA button and select the file with the extension tar.md5 inside the directory with the unpacked firmware.
- Click the Start button in Odin and wait until the firmware process is completed.
As I already said, this operation will return the smartphone to its original state, but will not reset the trigger, installed by the system Knox (if she was in standard firmware). Therefore, the service center may refuse to repair.
LG G2
Restoring the LG G2 to factory condition will also not cause special problems. The number of steps in this process is somewhat larger, but they themselves do not require special preparation and knowledge. So, what to do to return the G2 to factory firmware:
- Download and install ADB Driver Installer from here.
- Download official firmware(Europe Open 32G or Europe Open) from here.
- Download and install LG Mobile Support Tool, as well as FlashTool (goo.gl/NE26IQ).
- Turn off the smartphone, hold down the volume up button and insert the USB cable.
- Expand the FlashTool archive and run the UpTestEX.exe file.
- In the window that opens, select Select Type -> 3GQCT, Phone Mode -> DIAG, in the Select KDZ file option select the firmware downloaded in the second step.
- Click the CSE Flash button at the bottom of the screen.
- In the window that opens, click Start.
- In the next window, select the country and language and click Ok.
- We wait for the firmware to finish, and then turn off and turn on the smartphone.
This is all. But keep in mind that, as in the case of Samsung, the smartphone will still have Rooted status, and this cannot be fixed.
Sony Xperia Z2
Now about how to return to factory condition Sony smartphone Xperia Z2. As in the previous two cases, this will require stock firmware and the official utility for firmware. You launch the utility on your PC, connect your smartphone using a USB cable and start the update process. Step by step it all looks like this:
- Download and install ADB Driver Installer from here.
- Reset your smartphone to factory settings.
- Download and install Flash Tool from the official Sony website and latest firmware from here.
- Copy the firmware file to the C:/Flashtool/Firmwares directory.
- Turn off the smartphone and turn it on while holding down the Volume Down and Home keys.
- We connect the smartphone to the PC using a USB cable and launch the Flash Tool.
- Click the button with the lightning icon in the Flash Tool. In the window that opens, select Flashmode, double-click on the firmware in the list that opens.
WARNING
In many smartphones, an unlocked bootloader will not allow an over-the-air update.
In 90% of cases, unlocking the bootloader will entail deleting all data from the smartphone, including the memory card.
conclusions
Flashing a smartphone, and even more so gaining root access, is not at all such a scary and dangerous operation as it may seem at first glance. If you do everything correctly and do not resort to tools that unlock the smartphone’s bootloader, bypassing the manufacturer’s tools, you will not be able to brick your smartphone. Yes, in some cases you will have to tinker to return everything to its place, but what is better - to use a locked smartphone that does not allow you to do even half of the things that it is capable of, or get full control above the device? In the end, reinstalling Windows on PC it doesn't scare anyone.