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03-03-2013, 03:40 PM #1How to downgrade 6.15.00 baseband?
i accidently upgraded my iphone 3gs old bootrom from ios 5 to ios 6.1 and the baseband upgraded i forgot to preserve it
what can i do as there is no signal?
03-03-2013, 03:44 PM #2
If I'm not mistaken ultrasnow can unlock that baseband for you.
03-03-2013, 07:35 PM #3
For old bootrom, run redsn0w n update bb to ipad bb. Then run redsn0w again to downgrade bb to 05.13.
If however redsn0w doesn't recognize ios 6.1 , downgrade firmware lower than 6.1 with your saved shsh blob then do the bb changes.
I think Redsn0w 0.9.15 b3 is the latest