ok so my friend upgraded his 3gs on 4.1 to 5.1.1 thru itunes...so his baseband is now 5.16.05 and he doesnt have an official sim to get it activated. is it possible to jailbreak it? i read somewhere ipad basband is not compatible with new bootroms.. his serial number is 880014HY3**. can some one tell me if this is the new/old boot rom. i know if its the old bootrom then i can upgrade the bb to ipads n den jailbreak it... what if this is the new bootrom? can i still jailbreak it some how..tethered or untethered? right now the fone doesnt go thru the setup thing in 5.1.1. thank you in advance
It's possible to jailbreak it - just follow the instructions linked at the top of the page: How do I jailbreak iOS 5.0.1, 5.1, and 5.1.1? Jailbreaking it will also "hacktivate" it (unofficially activate it) so that it can be used as an iPod touch.
The concern with the serial number is really whether it's an "old baseband chip" or "new baseband chip" device - having an old/new bootrom is unrelated. It looks like that serial number is old enough to be compatible with the iPad baseband - see the carrier unlocking guide.
However, ultrasn0w is only compatible up to iOS 5.0.1. If you want to unlock it with ultrasn0w, you'll have to check to see if the device has SHSH blobs and then if it does, use them to downgrade the device - see here for a complete guide to this process.
answered 10 May '12, 17:57