Korg Opsix Owner's Manual page 93

Error messages that may occur when loading
You may see the following error messages if the opsix is unable to load the data.
There is no readable data
If the data is less than 4,104 bytes, or if the SysEx header is not in DX7 Program Bank format, the
data cannot be loaded.
Data contains unsupported data
Although the header is correct, the file cannot be loaded because the data in the file is corrupt.
For instance, the data may not be readable if the checksum is incorrect or if the F7 at the end of
the file is missing.
93