Click "Browse" and navigate to the MakeMKV firmware directory. Select the correct, untouched HL-DT-ST-BD-RE_BU40N-1.00 bin file.
Standard factory firmware on modern 4K Blu-ray drives often contains "AACS2" protection, which prevents third-party software from reading the raw data on a 4K UHD disc . Flashing the firmware (specifically the "MK" or LibreDrive version) "downgrades" or modifies the drive to bypass these restrictions . Key Benefits bu40n 1.00 firmware
Check the box for if using modified official tools, or follow the specific software prompts. Click Start or Write . Click "Browse" and navigate to the MakeMKV firmware
Flash to an "unlocked" version (like 1.03-MK) first if the drive has newer factory protection. Cross-flash to BU40N 1.00 to finalize the UHD setup. ⚠️ Critical Warnings Flashing the firmware (specifically the "MK" or LibreDrive
As movie studios pressured hardware manufacturers to block consumers from copying 4K discs, LG released subsequent firmware updates (such as 1.01, 1.02, 1.03, and higher). These newer updates actively block third-party software like MakeMKV or AnyDVD HD from accessing the raw data on a 4K disc. If your drive has a newer factory firmware, inserting a 4K disc will simply result in a "No Disc Inserted" or "Data Corrupted" error in your ripping software. The Solution: "UHD-Friendly" Status