iphone 3gs ( 05.12.01 )

[waveu]

Hello i have a question about upgradeing my iphone, i have a iphone 3GS ( black 16 GB ), jailbreaked, unlocked with software version 3.1.3 (7E18) and the firmware is 05.12.01 and i want to upgrade it to 4.0/4.1 or something like that, can someone tell me how i can do that ? I didn`t find any guide or smthing like that around here and i need to upgrade it asap.
Waiting for an answer & thanks a lot !
Best regards.

[j3st3r]

here are a couple of guides
iClarified - iPhone - How to Jailbreak Your iPhone 3GS Using PwnageTool (Mac) [4.3.3]
iClarified - iPhone - How to Jailbreak Your iPhone 3GS Using RedSn0w (Mac) [4.3.3]
iClarified - iPhone - How to Jailbreak Your iPhone 3GS Using RedSn0w (Windows) [4.3.3]

[Simon]

If you have a Mac use pwnage tool to make a custom 4.3.3 firmware and restore to that in iTunes. If on windows use snowbreeze to do the same. Restoring to a custom firmware will preserve your baseband so that you can still unlock after.

[waveu]

Thanks for the answer guys but i still have a little problem.I don`t know what u mean with the baseband...i`m not that used with the iphone .
I mean, i read the tutorial for 4.3.3 but i don`t understand what i need to do so i can after the update still unlock my iphone and use a custom operator.
Please help me and sorry for bothering you guys again ^_^.
Best regards.

[Simon]

Your baseband is your modem firmware. Right now you said you have 5.12.01. That is a good baseband to have so you will want to keep that baseband. In order to do that when updating you need to restore to a custom firmware made with pwnage tool or snowbreeze. Are you on Mac or Windows?

[waveu]

I`m useing windows xp

[Simon]

Then snowbreeze is what you will want to use: iH8sn0w.com | Jailbreak your iPod touches and iPhones

[waveu]

Ok Simon, thank you very much, i`ll try to do that