Bu40n 1.00 Firmware | [repack]

Open MakeMKV. Look at the "Drive Information" panel. Note the "Firmware version." If it is 1.00, you are done. If it is higher (e.g., 1.03 or 1.14), proceed.

It looks like you are referencing the for the LG BU40N (a slim, 9.5mm internal Blu-ray drive, often found in laptops or external enclosures). bu40n 1.00 firmware

This is often a "sleeping brick." Unplug the drive from power and USB for a full 60 seconds. Plug it back in. If still dead, you may have attempted to flash 1.00 onto a drive with native 1.05+ firmware, which is not possible via standard methods. Open MakeMKV