[proslacker]

I using a Unlocked 8120 on ATT. and I want to change to software on the device from Tmobile's to AT&T's.

I am concerned that once i change/upgrade. the new upgraded software might lock my free wifi features that im enjoying so much.

my questions is, if it does lock it, how do i make a backup of the TMobile software in case i want to go back to it.

Thanks ahead.