The steps to downgrade iOS 4.1 to iOS 4 or lower on your iPhone 4, iPhone 3GS, iPhone 3G and possibly on your iPod Touch. For the entire article visit our earlier post on downgrading iOS 4.1 which has full instructions and help to downgrade iOS 4.1 to a lower version.
You may also refer to our secondary guide for downgrading iOS which has tons of helpful comments on solving various problems related to the downgrade or look at some common errors including 3194/1015 while restoring iPhone.
Please note that you will require the SHSH blobs from iOS 4.0.1 to downgrade iOS 4.1. If you haven’t upgraded to iOS 4.1 yet, you can first backup your iOS 4 SHSH Blobs so that you can recover later.