Downgradie iOS4 to 3.1.2 (using windows)

Five hours of searching to get this right and finally!
1) get a copy of the firmware from a trustable site:
iPhone1,23.1.2_7D11Restore.ipsw
2) Go here: http://www.ihackintosh.com/2010/06/downgrade-iphone-3g-3gs-ios-4-gm-to-os-3-1-3/
Follow the directions to the letter. I hope this works for you

I used the same instructions to successfully downgrade (3.1.3 in my case).
My 3G iPhone was unusable with iOS4 (painfully slow and crashing every time the the screen lock was enabled). Now all is good again.
I will only add that you also pay close attention to the readme.txt in the RecBoot installation folder to avoid any USB driver problems under Win7.

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