: Press and hold the Volume Down button and the Power button at the same time.
Once in Recovery Mode, you can use the volume keys to highlight options like "Wipe data/factory reset" and the power key to confirm your choice. Are you looking to factory reset the phone, or are you trying to fix a specific system error while in recovery? Hard Reset NOKIA C21 How to Open Recovery Mode on NOKIA C21
: You should now be in the Android Recovery menu. Use the Volume keys to scroll and the Power button to select options like "Wipe data/factory reset" or "Reboot system now". Alternative Methods : Press and hold the Volume Down button
Release both buttons, and the Recovery Mode menu will appear. Common Uses for Recovery Mode How to Open Recovery Mode on NOKIA C21