At some point though, you might need to restore your jailbroken i Phone and through this guide we will help you do just that.
First of all you need to make sure that you have the latest i Tunes version on your PC or Mac.
Bypassing the Lock Screen on i OS 9.2.1Erasing and Restoring with i Tunes Community Q&A If you've forgotten your i Phone's passcode, you can erase the phone's data and passcode with i Tunes, then restore using a backup.
Your passcode will be removed in the process, allowing you to set a new one.
Apple last week released i OS 9.3, a major new i OS update that includes several great new features.