Everytime i try to download iso5 update for my iphone 4  i keep getting an error and it says if i proceed to update i will lose all contents in my phone?

im having trouble downloading the new update iso5 .  . . . everytime it is almost to the end of downloading an error will pop up...? help please

What exactly does the error say?
Updating to iphone 5 does indeed erase your iphone, then it restores the data (assuming you have made sure that everything on your iphone is on your computer first).

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