Hey everyone,

I need some help. I'm selling my iphone 3GS and the key to the sale is that my phone is still running firmware 3.1 (7C144), so it's unlockable.

I'm selling my phone in a few hours. I just backed it up, and then went to restore it, and it says it will automatically update to the newest firmware. If that happens, my sale is dead.

How how how do i restore my 3GS back to factory settings, but still keep the 3.1 firmware intact? The modem firmware is 05.11.07

Is it easier/less risky to manually delete everything from the phone and then sell it?

Thanks so much in advance! I really appreciate the help here..