3Gs 4.2.1 jailbreak
i just jailbroke my 3gs (new boot) and i couldnt get service.. i tried re-jailbreaking, re-booting numerous amounts of times..i did download ultra sn0w and still i kept getting Searching and no service in the upper left corner.. after a few more digging i noticed my modem firmware stayed at 05.15.04, as its supposed to upgrade to 16.15.0 and iam thinking that can very well be my problem..i tried re jailbreaking agin but still the firmware stays at 05.15.04 how do i fix this?? i need my phone back
Simply installing ultrasn0w is not enough to update your baseband to 06.15
Originally Posted by A32
Firstly I recommend you try to get the carrier you originally purchased the phone from to legitimately unlock your phone (if this was AT&T - don't bother trying)
If you cannot get an official unlock, then 6.15 is your only unlock solution right now.
I don't recommend you go to 6.15 unless you have a SHSH saved for iOS 4.1 - you cannot restore to stock 4.2.1 once you go to 6.15 baseband and as you have new bootrom 3GS you cannot restore custom 4.2.1 IPSW either (so you are pretty much screwed if you install something that breaks your jailbroken iOS 4.2.1 + 6.15 baseband)
Here's the iClarified guide that includes instructions on the baseband updating step. iClarified - iPhone - How to Jailbreak and Unlock Your iPhone 3GS Using RedSn0w (Windows) [4.2.1]
Let me re-iterate, avoid updating your baseband if possible, don't do it if you don't have a 4.1 SHSH (you needed to have saved this already, it's way too late now)
This has all been discussed in other threads, it doesn't need a separate thread just for you.
Thread closed, duplicate.