Possible issues.
* No system folder (or incomplete - which could have been missed due to being hidden).
* Incomplete Audio Drums (some starting right at about 310 -> were later added by the 2010 USB Pen Drive update and some (older) were replaced/updated. If your back up was created before loading the 2010 USB upgrade (first USB pen Dive out), then you are missing these files.
* Are the files you are trying to load back into this AUDYA originally taken/copied from THIS particular Audya?

Thanks,

AJ