Originally posted by dhc014
If you tried to use RPCDE on your Liteon DVD Burner, then you changed one byte in the EEPROM and this caused the checksum to not match and the drive will now refuse to work. You have two options. Use the Zebra mod v4 to fix the checksum in your EEPROM backup or else flash the drive with a firmware that has been patched to remove the EEPROM check.
Ah yes I remember that now. Silly me I even have a note about it in my LiteOn tools guide
You could also read this thread. Although if the above methods work if will be easier.
Plus if you do the Z-Mod you will end up with a better drive (811S)