Windows users might prefer the performance of 1.03 or 1.04, but for those running Linux systems (Ubuntu, Debian, etc.), the BU40N behaves much better on the 1.00 firmware. Linux users have reported that while newer firmware limits the drive to 2x read speeds for UHDs on Ubuntu, reverting to version 1.00 restores the drive to its full 6x capability.
drive, you typically use a tool like the to "downgrade" or side-flash the drive to version 1.00.
The is an LG/HL DS (Hitachi-LG) slim internal Blu-ray drive. The "100" likely refers to firmware version 1.00 (or a similar early build), which is often sought after because earlier firmware versions (1.00, 1.01, 1.02, 1.03) are friendly for LibreDrive and can be flashed to enable UHD (4K Blu-ray) ripping.
If you are downgrading from a high factory version (like 1.03), ensure the "Encrypted Firmware" box is checked within the tool. bu40n 100 firmware hot
: While newer "MK" (MakeMKV) versions like 1.03 or 1.04 are great for that specific app, version 1.00 often works better with a wider range of software, including DVDFab and Leawo Prof Media for creating ISO backups with menus.
Firmware 1.00 does not have the power-saving restrictions found in later updates (1.01, 1.02, 1.03). The OEM firmware assumes the drive is inside a well-ventilated laptop. When used in an external USB enclosure, the laser diode runs at higher current, generating significant heat.
: Some users report that newer firmwares introduce bugs when writing to high-capacity 100GB BD-XL discs, whereas version 1.00 remains stable for both reading and burning. Windows users might prefer the performance of 1
The Complete Guide to BU40N 1.00 Firmware: Why This "Hot" Downgrade Is Key for 4K UHD Ripping The HL-DT-ST BD-RE BU40N
If you have a BU40N with 1.00 firmware, do not use official LG update tools. They will "lock" your drive, making it significantly harder (though not impossible) to revert to a UHD-friendly state. How to Check Your Firmware Version
Restart your computer, then reopen MakeMKV. The Drive Information section should now display: BU40N Revision: 1.00 LibreDrive Information: Status: Enabled Essential Troubleshooting Tips The is an LG/HL DS (Hitachi-LG) slim internal Blu-ray drive
+--------------------------------------------------------------------------+ | BU40N FIRMWARE SELECTION | +--------------------------------------------------------------------------+ | | | [Stock 1.05 / 1.04] --> Factory-locked, blocks UHD archiving | | | | [Modified 1.03-MK] --> Fast LibreDrive mode, limited cross-app support| | | | [DE Unpatched 1.00] --> "Hot" choice: Max burning stability, native | | multi-software compatibility (DVDFab/MakeMKV) | | | +--------------------------------------------------------------------------+ Broad Multi-Application Support BU40N Firmware for both MakeMKV and DVDFab
What does your drive currently display in MakeMKV?
While the idea of unlocking a drive's full potential is appealing, there are significant risks associated with flashing firmware, particularly with modified versions:
: Many users report that 1.00 is more reliable for burning 100GB BD-XL discs compared to newer stock or modded versions. Common Challenges with BU40N 1.00 Availability