• michal
• 1 day ago
• Categories: Karbonn
• Categories: A21
• Free: Free warranty check

1. Power off the device by pressing the Power button for a few seconds.

2. After the phone turns off, press & hold the Volume Up and Power buttons.

3. Release the buttons when the screen turns red.
4. Congrats, you are in the Fasboot Mode now. It can be navigated with Volume Keys (movement) and Power button (selecting).