Is it possible to unlock for tmobile using 4.3.5 firmware? but i still have SUHS blob

[juicyjuice]

I just got an iphone 3gs with firmware 4.3.5 and baseband 05.16.02, i jailbroke it and it worked fine but i want to use it for tmobile. is there a way to do this? although i heard is not possible, i heard that i have to upgrade the baseband, but how do i do that? the only SUHS blob i have in the phone is 4.3.1... can i do something with the 4.3.1 firmware for it to work? downgrade? please i want to use it as a phone for tmobile. thanks

[iYeow]

Yes, it is possible to unlock by updating to ipad baseband.
Downgrade to stock 4.1 and use redsn0w to jailbreak first and then run redsn0w to install ipad bb to be unlocked by ultrasn0w from Cydia.