Downgrading iPhone 3GS back to 3.1.2 from OS4 to Jailbreak?

Aurora Dommink

New member
If you have accidentally updated your iPhone 3GS and can no longer Jailbreak it is possible to downgrade back to its originally 3.1.2 here's the link ....

http://thetechjournal.com/electronics/iphone/downgrade-ios-4-iphone-3gs-3g-and-ipod-touch-to-iphone-3-1-3-3-1-2steps.xhtml

What I want to know is will it wipe my iphone? And if so, can I sync before hand and fix her up later after?
 
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