restore as new to 3.1.2 possible?
I have an iphone 3G jailbroken and unlocked, using on tmobile. I want to wipe it out to give to my daughter, but it needs to be unlocked again for tmobile.
I have an original itunes install file from October 2009 on a pc not connected to the internet. I've completely wiped this computer of all apple programs, files and folders, and I'm about to reinstall itunes using that file from last year.
I'm hoping I can restore as new using iphone 3.1.2 with this fresh, non-updated install of itunes, so I can re-unlock and re-jailbreak using blackra1n (still installed on same pc).
I could be way off in thinking this might work. so before I completely screw this up, what should I know about?
edit: the install file won't install for some reason. but I'm reading in other threads about upgrading to 3.1.3, then downgrading the baseband to jb and unlock.
I ran f0recast, and my current baseband is 05.11.07 with bootloader 6.4 and model MB702.
I just want to wipe it to "new" status, but be able to jb and unlock after...