unlocking iPhone 3G

[backstroker09]

Hi, so I used to have an iPhone 3GS and I messed it up by updating to 6.15.00 baseband, and had to sell it because of a signal problem and there was no way to downgrade the baseband. I do not want to have this happen again so I need your help!

I currently have an iPhone 3G - 16 GB White. It is running on Firmware 3.0 (7A341) and Baseband 04.26.08. My carrier is T-Mobile. I used redsn0w 0.7.2 to install Cydia and then i used ultrasn0w to Activate my phone and it now works with T-Mobile!

Only problem with all of this is, I would like to have 4.0 or higher firmware. I know how to put the iPhone into DFU mode and then hit Shift + Restore in iTunes to select a firmware. I am scared if I select 4.0 or higher, that it will also update my baseband (04.26.08) and if that happens then it won't be supported by ultasn0w, and I do not know any other method of unlocking other than updating to 6.15.00 which SUCKED! I never want to do that again.

So to make a long story short, if I upgrade my firmware, will it update my baseband? If so, how can I make sure that it stays on 04.26.08 when updating? Should I create a custom IPSW file using sn0wbreeze?

[Cer0]

Yes it will.

Use a custom firmware.

[backstroker09]

Okay can someone help me find a good custom firmware? I don't really care which 4.0, 4.1, 4.2.1, 4.3.3. As long as I can unlock it still with ultasn0w, it doesn't update my baseband, and whichever firmware you prefer is the best, ohh and also so that its untethered.

[DevouredDreams]

just download ios 4.3.3
then download the newest sn0wbreeze and make one yourself. Probably be easier that way.

[backstroker09]

just download ios 4.3.3
then download the newest sn0wbreeze and make one yourself. Probably be easier that way.

Okay so I used sn0wbreeze 2.1 and created a custom firmware for 4.1 (8B117) and then I put the device in DFU mode, then I used iTunes and hit Shift + Restore. I selected the file that was created by sn0wbreeze, It then did its usual loading. And now IM STUCK with the apple logo it wont go away.

I googled it and it told me to put it back in DFU mode and restore again using the custom firmware again? I tried that.. but then I got Error 1600. Then I installed iREB and it's supposed to fix error 1600, but it didn't fix anything.

So now my phone is just stuck on the apple logo and I don't know how to get out of it, someone plz help