Karbonn smart A12 star hard reset:
1. Charge the battery upto 70 percent.
2.Turn off your Karbonn Android phone.
3.Turn ON the device by pressing and holding the VOLUME UP and power key together.
4. Chhose language English by pressing Power key.
5. Select wipe data/Factory reset using volume key and power key to enter.
6. Select Yes-delete all user data and enter by Power key.
7- When wiping is completed, select reboot system now by pressing Power key.
7. Hard reset is done switch ON the mobile.