In recovery mode, users can access their device’s test functions, install updates and patches from a computer or microSD card, and even flash new firmware or a custom operating system. Depending on the version of Android and the manufacturer’s customizations, the options can vary from one phone to the next. What follows is mostly of interest to programmers. Don’t bother with it unless you’re an expert.
You can access recovery mode and other features by rebooting to the bootloader menu, which is where you will find them.
Fasten your boots: Fastboot is a tool for developers that allows them to send commands to Android devices from a computer. It is currently only available on Pixel phones and a small number of other devices. The Android software development kit (SDK) is essential.
Update via Android Debug Bridge (ADB): ADB is short for Android Debug Bridge and is another tool used by programmers to remotely issue commands. The Android Software Development Kit (SDK) is needed for this, and more information can be found on the Android Developer website.
To update Android’s firmware using an SD card, select Settings > System > Update > Apply update from SD card.
Mounting /system makes normally hidden system files and directories available for use. You can access and modify files on a partition by mounting it.
Examine the recovery logs to see the technical records of what happened during the recovery process.
Developers can put the graphics processing unit (GPU) to the test with this button.
Another tool available to app developers for testing language translation is the “run locale test” command.
This will power down your device.
This option appears exclusively on Samsung devices and appears to initiate app optimization. ‘Optimizing apps’ may appear on screen after a software update; tapping this button will manually initiate the process, which may resolve issues with specific apps.
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