Everytime I try to restore my iPhone I get half way through it then it gives me a -20 system error message and then tells me the back ip is corrupt. Can someone help?

October 11 5
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I am trying to update my iphone and once it gets to the restoring process I get " An error occurred while restoring this iPhone (-20)". Once I hit ok I get "iTunes could not restore the iPhone " " because the backup was corrupt or not compatible with the iPhone that is being restored". But about a month ago we updated another iphone we have same model. Can someone tell me what to do or how to fix this?
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Are you running modified software on your phone?  This error seems to be common if the firmware has been modified and you're trying to restore the phone again. 
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