OK so I was getting ready to sell my 3GS and it needed to be jailbroken and unlocked. I had already done this so no big deal. I go to reset and erase all content to ship it out and the phone did its thing for about 10 min then froze on the start screen. I tried hard resetting it several times but it didn't work. I left it for over 2 hours and nothing helped so I had no choice but to restore to 4.0.2. I am pretty sure I have an SHSH blob stored on Cydia for 4.0.1, I know for 4.0. How do I revert back? Or has there been any method to JB 4.0.2? I have a Mac and PC so I can use anything you guys have in mind. Thanks.