3GS Baseband 3.5

[xpsm1730]

New 3GS on 3.5 firmware - can I unlock this to use it on T-Mob?

Can I downgrade this? Is there anyway to use Tmob on this phone?


Thank you!

 

[Mystikal]

New 3GS on 3.5 firmware - can I unlock this to use it on T-Mob?

Can I downgrade this? Is there anyway to use Tmob on this phone?


Thank you!

There is no 3.5 firmware...

 

[The General]

the newest jailbreakable firmware is 3.1.2
the newest unlockable baseband is 4.26.08

nothing from the future is supported by ultrasn0w or pwnagetool.