I got an older Ricoh 7125A CD-RW with was patched with an AOpen FW. Now I want to re-patch this device with an original Ricoh FW. But I have to make some changes to the FW file before. So I have to re-calculate the checksum of the file. I thought it is a crc32 checksum take place in the first four bytes of the file, but it doesn't seem to be. Anyone who can help ?
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