While newer firmware like or 1.04MK is often recommended for MakeMKV users, the original 1.00 (DE_LG_BU40N_1.00) remains a staple for power users.
It allows the drive to read dirty or slightly scratched discs more efficiently by ignoring artificial software timing blocks. Step-by-Step: How to Safely Flash Your BU40N Drive bu40n 100 firmware hot
Check the box labeled (if using a modified official bin) or ensure your tool is set to allow downgrades. While newer firmware like or 1