Hard Reset SAMSUNG i637 Jack
- On the Home screen, select Start ➔Settings➔Security➔Master Clear and press the Confirm center key.
- Press the Yes soft key to confirm. The phone resets and reboots itself.
- While the phone is off, power on the phone while holding the 5/F key.
- The Format Menu displays.
- Press Master Reset.
Help! This doesn't work
Hard Reset will erase all of your data
All described operations you are doing at your own risk.