The physical disc is not dead. But preserving its contents in the digital age requires the right tools. The LG BU40N running firmware 1.00 remains the gold standard. Last updated: October 2025. Always check the MakeMKV forums for the latest flashing tools and firmware binaries, as links and methods change periodically due to hosting takedowns.
Introduction: The Holy Grail of Optical Drives In the world of physical media preservation, few pieces of hardware have achieved the legendary status of the LG BU40N slim internal Blu-ray drive. However, within enthusiast circles—specifically those involved in 4K UHD ripping, backup, and playback on PC—one specific version stands head and shoulders above the rest: BU40N 1.00 firmware . bu40n 1.00 firmware
If you have a BU40N drive with version 1.03 or 1.04, the downgrade process to 1.00 is safe, well-documented, and reversible. If you own a drive with 1.00 already installed, consider yourself lucky. And if you are shopping for a new drive specifically for 4K backup, seek out a vendor who can guarantee BU40N 1.00 firmware—or at least a drive capable of being flashed back to it. The physical disc is not dead