If you have an SD card installed, the system may ask if you want to format it. Do not erase the SD card unless you want to clear external storage too.
A new screen will appear asking for confirmation. How to Hard Reset NOKIA T21
When the Fastboot menu appears, use the Volume buttons to navigate and the Power button to select. If you have an SD card installed, the
The for the reset (forgotten password vs. slow performance) When the Fastboot menu appears, use the Volume
Ensure your T21 has at least 50% battery life to prevent the device from shutting down mid-process, which can cause software corruption.
On a computer or another phone, go to android.com/find .
Hard resetting your Nokia T21 is the most effective way to resolve persistent software glitches, remove a forgotten lock screen pattern, or wipe your personal data before selling the tablet. This process restores the device to its original factory settings.