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流傳 ~ Downgrade iPhone OS 3.1 to 3.0 for iPhone 2G 3G 3GS

How to Downgrade iPhone OS 3.1 to 3.0 for iPhone 2G 3G 3GS

Dev team already warned don’t upgrade to 3.1 and wait for next version of Pwnage Tool to preserve your baseband. Upgrading to 3.1 with Ultrasn0w installed will cause people to lose Ultrasn0w and will be unable to get it back. OS 3.1 contains a baseband update 5.11.04 BB for iPhone 3G and 3GS. The latest  Modem Firmware 5.11.04 BB which is not down gradable. So if you accidentally updated your iPhone 2G, 3G or 3GS to OS 3.1 here is the handy guide for downgrading. Remember this will not downgrade your baseband only your firmware will be downgraded. It’s possible to downgrade OS however we strongly suggest you to carry on with OS 3.0 until Dev team releases Pwnage Tool.

iPhone 3GS users please note : I am not sure whether this method works for you or not, We used this method with OS 3.1 successfully but the reports over net suggests Apple blocked downgrading for 3GS. But if you are accidentally upgraded to 3.1 and there is no way for you then you can try and confirm this method for sake of other users.

Update for iPhone 3GS : So as of today, Apple has stopped signing 3.0 and 3.0.1 restore files. That means that if you have a 3GS iPhone you cannot restore any firmware other than 3.1. If you are happily jailbroken today and something goes wrong you are pretty much screwed. So this means you can’t downgrade even your OS from 3.1 to 3.0

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