Posted on 08 September 2009, at 9:16 am, by Larry Greenberg

This one comes straight from the iPhone Dev. Team, the group responsible for bringing you all the tools which jailbreak and or unlock your iPhone.
In a nutshell it looks like the Dev. Team believes an iPhone update is coming this week (maybe to provide MMS?), and they warn that if your phone was unlocked using their ultrasnow tool, not only will you lose the unlock, you may just lose it permanently, never being able to unlock your phone again.
This week Apple will be all over the news with their announcements at Wednesday’s “Let’s Rock” event.  But with so many new owners of the iPhone 3GS, and with so many new owners of the iPhone 3G (perhaps sold to them buy these new 3GS owners)…now is a good time to send out this general advisory.
If you update to Apple’s new software using the normal iTunes process, you will lose your ultrasn0w unlock.  In fact you may lose it permanently, because for most people the baseband firmware cannot be reverted to a previous version (unlike the main application CPU firmware).
But don’t worry…our PwnageTool program let’s you update your main firmware without touching your baseband firmware, so you can still have the best of both worlds.  But you must be diligent about saying “no” to your iTunes request this week to update your firmware.
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