HT1386 I have an iphone 4 which quit working and I had my iphone 3 reactivated until I get my 4 replaced or fixed.  My computer does not recognize my iphone 3 when I plug it in. I also cannot figure out how to apply my last backup to my iphone 3

I have an iphone 4 which quit working and I had my iphone 3 reactivated until I get my 4 replaced or fixed.  My computer does not recognize my iphone 3 when I plug it in. I also cannot figure out how to apply my last backup to my iphone 3

If your iPhone 4 was running iOS 5, you can't install iOS 5 on an iPhone 3G which means you can't restore the 3G from the backup of the iPhone 4 running iOS 5.
http://support.apple.com/kb/TS1538

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