Iphone 3g error when updating to iphone 4.0

This is my third attempt at adding the above, after approx 40 mins of backing up my Iphone I get the following error message Iphone 4.0 cannot be installed (error-402653138). Continuing this will cause you to lose all data on this phone - Does anyone have any ideas????
Thanks

I'm sorry I cannot help you with the error. But I am worning you against upgrading to iOS 4!
I unfortunately did upgrade, but deeply regret it. For some reason Apple seems to make it impossible to go back to the original iOS with your iPhone?
The iOS 4 will slow down your iPhone 3G significantly and does have errors in it that will result in crashes. I have experienced 3 within a week, when I cannot remember when I had an issue with my iPhone 3G before iOS 4. - Only one hardware issue, which was resolved to my satisfaction over 6 months ago.
So, think twice about the upgrade! If you still plan to upgrade, make recovery plans. Google on how to save your 3.1.3 backup and how to fall back when (not if) you get frustrated with iOS 4. I didn't and am now seriously considering throwing my 3G out. (And not going to buy a new iPhone!)

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