I need some guidance. I currently have a 3G that is jailbroken and unlocked. I picked up a 3GS on eBay with the old bootrom and running 3.1.2. When I get this phone, what is the proper way to switch from my 3G to my 3GS without losing the 3.1.2 on the S? Do I simply restore the 3GS from my 3G backup through iTunes then jailbreak and unlock? I have found the proper info for prepping my 3G to sell in its jailbroken form by searching so I am good there. Any help here is appreciated. I searched for a while here and couldn't find anything specific about switching phones with one being jailbroken.