Hard Reset KARBONN A21
- Press Power button, until your phone is on.
- Now press and hold together Volume Up + Power button.
- Then you will see green screen (don't release Volume Up key).
- When you see red screen (maybe after 10 seconds), release Volume Up button.
- Next you should see Recovery options.
- From the menu choose "wipe data with factory reset" and press Power button for 2 seconds.
- After that select "yes", and accept this with pressing Power button for 2 seconds.
- Choose options "reboot".