Wait 10 to 15 seconds until the device completely shuts down and stops vibrating. Step 2: Trigger the Bootloader Combination
Important assumptions and notes
The Nokia T21, an enterprise-focused tablet, includes a hidden Recovery Mode partition used for system-level diagnostics and repairs. This paper outlines the precise hardware key combination required to access this mode, as the traditional "adb reboot recovery" command may be disabled on stock firmware. How to Open Recovery Mode on NOKIA T21
Maintain at least 50% battery life. A power failure during a recovery operation can corrupt the internal storage.
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This is where many users get confused. The touch screen usually does not work in this basic recovery mode. You must use the hardware buttons to navigate:
Allows advanced users to manually flash official firmware updates or custom ROMs via a computer connection or a microSD card. Maintain at least 50% battery life
Android features Factory Reset Protection (FRP). If you reset your device through Recovery Mode, you must log in with the Google account previously linked to the tablet to unlock it. Step-by-Step Guide: Booting Nokia T21 into Recovery Mode
Keep holding both buttons until you see the Nokia logo or the Android robot icon. Once you see either, release both buttons.
While holding Power, quickly press the button once. Release both buttons.
Keep both buttons held down firmly. Do not let go when the tablet vibrates. Step 4: Release Buttons on the Logo Screen