Downgrade iPhone 3G from iOS4 to 3.1.3

Yes, I upgraded and yes I regretted it almost immediately. Ponderous, sluggish performance ruined any joy derived from new features.

Luckily Lifehacker came to my rescue:

http://lifehacker.com/5572003/how-to-downgrade-your-iphone-3g%5Bs%5D-from-ios...

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