Upgrading to a newer stock firmware often locks the bootloader, making it incredibly difficult to flash the drive back down to a previous version using standard software tools.
Once running 1.00, the BU40N behaves remarkably well for a slim drive:
To apply this firmware, users typically use a utility called , which can be found on the MakeMKV Forum . Important Note:
However, modern firmware revisions (1.01, 1.02, 1.03, and later) contain strict (Advanced Access Content System) handshakes that prevent the drive from being used with ripping software like MakeMKV.
: Some users report that version 1.00 avoids "odd issues" found in newer versions, such as difficulties reliably burning 100GB BD-XL discs or random ripping stalls. Flashing and Downgrading
: Version 1.00 is an official Ultra HD Blu-ray certified firmware. Newer stock firmware versions often remove support for direct 4K playback in licensed software like CyberLink PowerDVD Reliability
Ensure the "Encrypted Firmware" or "DE" (Data Extractor) settings are correctly checked based on the specific flasher instructions.
With firmware 1.00, the BU40N becomes "UHD Friendly." It allows you to insert a legally purchased 4K movie and back it up to your local media server (like Plex or Jellyfin) as an uncompressed MKV file. The Threat of Newer Firmware (1.01, 1.02, 1.03+)
Because LG no longer offers 1.00 for download (they only host newer versions on their support site), obtaining it requires community sourcing. The primary method is the (developed by MakeMKV forum user MartyMcNuts) or the command-line sdftool .
Upgrading to a newer stock firmware often locks the bootloader, making it incredibly difficult to flash the drive back down to a previous version using standard software tools.
Once running 1.00, the BU40N behaves remarkably well for a slim drive:
To apply this firmware, users typically use a utility called , which can be found on the MakeMKV Forum . Important Note:
However, modern firmware revisions (1.01, 1.02, 1.03, and later) contain strict (Advanced Access Content System) handshakes that prevent the drive from being used with ripping software like MakeMKV.
: Some users report that version 1.00 avoids "odd issues" found in newer versions, such as difficulties reliably burning 100GB BD-XL discs or random ripping stalls. Flashing and Downgrading
: Version 1.00 is an official Ultra HD Blu-ray certified firmware. Newer stock firmware versions often remove support for direct 4K playback in licensed software like CyberLink PowerDVD Reliability
Ensure the "Encrypted Firmware" or "DE" (Data Extractor) settings are correctly checked based on the specific flasher instructions.
With firmware 1.00, the BU40N becomes "UHD Friendly." It allows you to insert a legally purchased 4K movie and back it up to your local media server (like Plex or Jellyfin) as an uncompressed MKV file. The Threat of Newer Firmware (1.01, 1.02, 1.03+)
Because LG no longer offers 1.00 for download (they only host newer versions on their support site), obtaining it requires community sourcing. The primary method is the (developed by MakeMKV forum user MartyMcNuts) or the command-line sdftool .