In order to hard reset a Sharp 902, you should perform the following steps.

Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Sharp 902 device will be brought back to the default configuration of a brand new device.

 

1. Press & hold the Power button until the phone turns on.

2. Now press Menu button. Select Settings > Master Reset > Reset All. Enter your security code, which by default is 0000 or 000000, and confirm with OK.

3. Wait until the phone resets and restarts. Complete.