> i get this error for area51
>
> wrong chd sha1: area51.chd [wrong: 7c8fb2e8487ba0a03f09cc2e643b62ad6844051b]
> [right: 9ea749404c9a5d44f407cdb8803293ec0d61410d]
> wrong chd md5: area51.chd [wrong: 90a1d4f0ce9ec32bd923d6d8c68a9e46] [right:
> 130b330eff59403f8fc3433ff501852b]
>
> can i fix the sha1 and the md5 of a chd file?


No. Since the given wrong-sha1 doesn't match any sha1 in current MAME, esp. no other area51 clone, I'm rather sure the chd is bad.

Roman Scherzer
ClrMamePro