Okay guys im selling my unlocked and jailbroken 32GB 3GS this weekend. I need to find a version of 3.1.2 to restore back to and wipe the phone. It has been awhile since I have went through this process, so could someone point me in the direction of an untouched version of 3.1.2? Also, what is the best way to wipe the phone to prepare for the new owner? Thanks in advance.