HELP
My Iphone 4 is going back as its faulty so ive dusted my old iphone 3G down and tried to restore it from my latest back up of my Iphone 4

ITunes wont let happen and says something about outdated software

I have done this before (some time ago) and it worked

Any ideas please, having no phone for 3 days is like losing a leg...

iOS 4.2 was the last version that supported the 3G.

If you're running a higher iOS version on your iPhone 4 then you won't be able to restore a backup from it to the 3G.

Is there any way to get the iphone 4 back to the same ios as the iphone 3g to run the back up then restore the iphone 4 so i can then send it back ?