Just as promised, the iPhone Dev Team has released an iOS 4.2.1 unlock for the iPhone 3G/3GS. Unfortunately, it’s a lot riskier than before.
In a nutshell, this unlock works by updating the baseband on your iPhone 3G/3GS to baseband 06.15. That’s the baseband bundled with iPad firmware 3.2.2 which, fortunately, is vulnerable to the AT+XAPP exploit. This baseband is fully compatible with the mentioned iPhone models. The current baseband used in iOS 4.2.1 is 05.15 and, more importantly, AT+XAPP is gone already.
The risk here is that by upgrading to baseband 06.15, you won’t be able to downgrade to a lower baseband anymore and restore to a stock firmware. As such, if you encounter any problems with your iPhone, you won’t be able to hide the fact that you tampered with your unit’s baseband, thus voiding your warranty. You also won’t be able to upgrade to a future baseband that’s bundled with a critical fix unless it’s already higher than 06.15.
If you fully understand the risks involved here (heck, if you fully understood the above paragraphs!) and still want to proceed, there’s PwnageTool 4.1.3 Unlock Edition for you to use (Macs only). Aside from allowing you to cook up your own custom firmware, this particular jailbreak also gives you the option to upgrade to the iPad’s baseband (Note: you must have a copy of iPad firmware 3.2.2 on your computer. You can still get this direct from Apple).
Once you’ve updated the baseband, you can download ultrasn0w 1.2 from Cydia (repo: http://repo666.ultrasn0w.com). This new ultrasn0w unlock works with iPhone 4 baseband 01.59.00 and iPhone 3G/3GS basebands 04.26.08, 05.11.07, 05.12.01, 05.13.04 and, of course we can’t forget, 06.15.
Non-Mac users will have to wait a little longer though. They’re still prepping an updated version of redsn0w, which comes bundled with the baseband upgrade option.
You can download PwnageTool 4.1.3 from here (torrent) or check out the iPhone Dev Team’s blog post where they have a complete listing of unofficial mirrors. For a detailed guide on how to go about using PwnageTool 4.1.3, you can head on over here.
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