You can't a CRC of a file (the only way is to hack it)... You see, CRC are like a code of authentification. A good example would be that you download a Zip/Rar and cannot extract it because the CRCs of file(s) have changed after the compression. Namely, someone has fiddled with the archive afterwards and the archive has become corrupt. (I'm not sure of how CRCs are actually assigned etc, this is just my hypothesis.) You don't have a corrupt archive., it's just that you have a different P1 rom... I'll send you the 8Awhatever P1 rom, since we're just going back and forth here without actually getting anything done.