thats because that rom is locked to the sid of the person/place where it was originally purchased from.
when you buy his rom he locks it with your home sid so that it cant be shared and used without paying for it.
the computer the rom is on cant leave the home sid area or the flash will fail,in your case your not in the same sid as the person who bought that rom,so it will load but fail everytime,that is why. but once the phone is flashed in the correct place it will work anywhere. its a pretty cool lock,very unique.
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