iPhone Dev-Team Releases iOS 4.2.1 Unlock for iPhone 3G, 3GS

iPhone Dev-Team Releases iOS 4.2.1 Unlock for iPhone 3G, 3GS

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The iPhone Dev-Team has released the iOS 4.2.1 unlock for the iPhone 3G and iPhone 3GS.

Please read their announcement very carefully...

Today we’re pleased to announce our free carrier unlock for iPhone3G/3GS owners with a baseband later than 05.13.04. The unlock for that baseband exploited the AT+XAPP command, thanks to a crash initially discovered by @sherif_hashim (@Oranav also found this crash). So what hole are we exploiting today, since Apple closed that AT+XAPP hole? Well, we’re exploiting the exact same hole!

It turns out that the very first iPad firmware 3.2.2 has baseband version 06.15.00 still vulnerable to AT+XAPP. The iPad baseband is built for the exact same baseband chip as the iPhone3G/3GS — they’re fully compatible! Some of us have been running 06.15 for weeks now on our iPhones in preparation for this release.

Since 06.15 is a higher version than 05.14 or 05.15 (where AT+XAPP is gone), anyone stuck at those versions can simply upgrade to 06.15 to unlock again! Luckily for us, Apple *still* provides the iPad FW 3.2.2 with this vulnerable baseband right from their own servers. (Grab it now, before they take it down!)

We’ve been busy updating both PwnageTool and redsn0w to make the baseband update as seamless as possible.

1. First up is “PwnageTool 4.1.3 Unlock Edition”. It has a special dialog box which will ask you if you want to update to the iPad baseband. You must already have the iPad 3.2.2 IPSW on your computer (see the above link)….so just point PwnageTool at it (or let it find it on its own if you’re in “simple” mode).
2. Directly after PwnageTool 4.1.3 is available, the official ultrasn0w repo http://repo666.ultrasn0w.com will be updated with ultrasn0w 1.2, which covers iPhone 4 baseband 01.59.00 and iPhone 3G/3GS basebands 04.26.08, 05.11.07, 05.12.01, 05.13.04 and now 06.15.00.
3. Finally, we’ll release an update to redsn0w today for those without Macs and can’t run PwnageTool. The new redsn0w will give you the option to update your baseband to 06.15 too.

1. There is no way to come back down from 06.15, and there’s no hiding the baseband version from Apple. You’ll be voiding your warranty in a very obvious way.
2. If some future baseband comes out with a critical fix, you won’t be able to update to it if it remains down in the 05.xx sequence (then again, you wouldn’t update to it if you wanted to keep your unlock anyway).
3. Starting with FW 4.2.1 if you have 06.15 on your iPhone you won’t ever be able to restore to stock firmware (it will fail). You’ll need to only restore to custom IPSWs (then again, if you’re unlocker you should already be doing that).

Certainly don’t update to 06.15 if you don’t need to! Only do this if you need the unlock and you’re stuck on 05.14 or 05.15, and you’re willing to assume the above risks.

This PwnageTool also contains a 4.2.1 bundle for iPhone3G owners…for all else, it’s still only 4.1. If you have an iPhone3GS with an old bootrom, the new redsn0w will handle 4.2.1 for you (in fact it covers 4.2.1 for all devices, even though some of them are still tethered at 4.2.1 until @comex can work some untethering magic). iPhone3GS users with old bootroms who want to go to 4.2.1 should not use this PwnageTool! Update to stock 4.2.1 first, then use the upcoming redsn0w to update your baseband.

We will be posting tutorials to help you with these new tools as soon as possible.

You can download PwnageTool 4.1.3 from here.

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iPhone Dev-Team Releases iOS 4.2.1 Unlock for iPhone 3G, 3GS

Thomass - November 29, 2010 at 5:07am
I have iPhone 4 4.01 BB 1.59 and on CYDIA SAYS THERES UPGRADE FOR ULTRASN0W should I UPGRADE or leave it or what???????
andrew - November 29, 2010 at 1:25am
I have a 3gs running 4.1 on baseband 05.14.02. as i understand it. there is currently no unlock for this baseband. if thats the case how can i change my baseband?? im dying for an unlock to use my iphone!! do i need to upgrade to 4.2.1 which will change my baseband?? I appreciate all your help and good work. your tech skills are above and beyond mine!!!
luisdk - November 29, 2010 at 2:32am
Iphone 3g 4.1 baseband 05.14.02, just unlocked, use redsn0w with the option of Ipad baseband , use Firmware 4.2.1, after process the phone remains with Firmware 4.1, baseband 6.15.00, after this ,unlock via Cydia with Ultrasn0w as normal, thats it.
Nels - December 7, 2010 at 7:44am
Will I be able to downgrade back to f/w 4.1 after I updated the baseband 06.15.00 in f/w 4.2.1?
Bada-Bing - December 14, 2010 at 6:12pm
yup....u have too...thats what i did...updated 4.1 to 4.2.1 which gave me the 06.15.00 baseband and downgraded back to 4.2.1 which still leaves my phone with 06.15.00 baseband...!
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