Unlock 4.2.1 unlock Ultrasn0w

A few days Ultrasn0w 1.2 has been released and  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.

All You must do Follow Ultrasn0w News to still Updated 

@Ultrasn0w2 

and

@Spirit_JB

 To Unlock iPhone 4

You Can see our Last Useful Posts :

• Ultrasn0w 1.2 Unlocks iPhone 3GS, 3G on iOS 4.2.1 [How to Guide]
• HOW TO: Update iPhone 3GS / 3G Baseband to 06.15.00 and Unlock it
• HOW TO: Update / Unlock iPhone 3GS / 3G Baseband 06.15.00 with Redsn0w 0.9.6b5 on iOS 4.2.1 / 4.1 [Windows & Mac]

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