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Wipe the cache partition: Temporary system files are stored here, but you will not find the option to delete the data on any Android device. Google has changed the way it works with Android 7.0 Nougat by introducing seamless updates. Not every Android manufacturer supports seamless updates, especially Samsung phones, so you’ll still see this option on the Galaxy S21, for example. If the option is available, try it. Choose Restart the system now when done to find out if it has solved your problem.
Data deletion / factory reset: As a last resort, you can use the recovery mode to restore your Android phone to factory settings, which will delete all applications, data and files, including text messages and photos. Just keep in mind that you will lose everything you have not backed up. If you use this method to delete your phone, you’ll need to sign in with your Google Account during setup. If you can’t sign in with a Google Account that was previously used on your phone, then you won’t be able to use your phone at all. This anti-theft feature cannot be bypassed. Read our guide on how to reset your Android phone to factory defaults to learn more.
Recovery mode also offers options for people who want to install new firmware or custom ROMs on their device and provides access to run tests and install updates from a connected computer or SD card. The options vary from phone to phone, depending on the version of Android and any modifications from the manufacturer. Most of the following are for developers. Ignore it unless you know what you are doing.
Restart to the bootloader: This will take you back to the startup menu, where you can access recovery mode and other options.
Enter fastboot: Available only on Pixel phones and a few other devices, fastboot is a tool that allows developers to send commands from a computer to an Android device. Requires Android SDK (software development kit).
Apply an update from ADB: ADB stands for Android Debug Bridge, another tool used by developers to send commands from a computer. This requires you to install the Android SDK and you can learn more about it on the official Android Developer website.
Apply an update from the SD card: This is to install the Android firmware from the SD card.
Mounting / system: This gives access to the main files and folders that are usually inaccessible. You can mount a partition to view and edit data.
View recovery logs: This shows technical log files that list events and actions in recovery mode.
Perform a graphical test: This is for developers to run tests with a GPU (graphics processor).
Run a locale test: This is another tool for application developers to test things related to language translation.
Shutdown: This turns off the device.
Application repair: This option appears to only appear on Samsung phones and triggers app optimization. You may notice that “Application Optimization” appears on the screen sometimes after a software update; this allows you to run the process manually and is likely to help you if you have problems with specific applications.
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