Bu40n 1.00 Firmware [extra Quality] Guide
If you accidentally update your BU40N past version 1.00 using official LG update tools, your drive will instantly lose its 4K backup capabilities. Cross-Flashing and LibreDrive
The version 1.00 firmware is the key that unlocks the drive's true potential. LG designed the early firmware with more permissive settings. By reverting or updating to this version, users can bypass the restrictions imposed by later firmware updates. The community considers it the , as it's the secret to transforming a standard BU40N into a powerful tool for legal backups, offering a rare combination of software compatibility, platform stability, and functionality.
Later versions sometimes cause the drive to "spin down" or stall indefinitely during a rip; 1.00 generally resumes or maintains speed more consistently. 🛠️ How to Get Version 1.00
The original LG BU40N firmware version 1.00 was released before these strict, unbypassable restrictions were fully implemented into the drive's code. This makes the 1.00 firmware "4K Friendly." It allows specialized archiving software to access the raw data structure of a 4K disc, enabling users to create bit-perfect digital backups of their movies for local media servers like Plex or Jellyfin. 2. The Problem with Newer Firmware (1.01, 1.02, 1.03+) bu40n 1.00 firmware
Once the software confirms a successful write, power cycle the drive. Your drive will now report as UHD-friendly or fully LibreDrive enabled. Summary of BU40N Firmware States Firmware Version UHD Ripping Status Stock 1.00 ✅ Supported The ideal factory state; native UHD-friendly behavior. Stock 1.01+ ❌ Blocked Patched by LG; requires downgrading or cross-flashing. Custom MK 1.00 ✅ Highly Recommended
Before diving into the firmware specifics, let's establish the hardware. The LG BU40N is a 9.5mm slim slot-loading or tray-loading Blu-ray writer. It is manufactured by Hitachi-LG Data Storage (HLDS). Its key specifications include:
Physically disconnect the drive from power (unplug SATA power or USB cable), wait 10 seconds, and reconnect. If you accidentally update your BU40N past version 1
The original is considered "friendly." It lacks the aggressive digital rights management (DRM) blocks found in later versions. Keeping or flashing your drive to version 1.00 allows standard backup tools to decrypt and copy your legally purchased 4K movies. Key Technical Specifications of the LG BU40N
Before attempting any disc backups, open a program like MakeMKV. Look at the "Drive Information" tab. It will explicitly list your drive name, the firmware version (e.g., 1.00), and whether LibreDrive support is enabled.
BU40N 1.00 Firmware: The Ultimate Guide to UHD Disc Ripping and Downgrading By reverting or updating to this version, users
Allows programs like MakeMKV to access the raw data on 4K UHD discs without restriction.
: Flashing is not a one-step process. Most guides recommend first flashing to a "MK" (LibreDrive) firmware to remove encryption before performing a recovery cross-flash to BU40N 1.00. Community Support
The 1.00 firmware is optimized for faster data reading compared to later, restricted versions, significantly reducing the time it takes to backup a 100GB 4K disc.
You will typically find this firmware file in:
Linux users have reported that DE 1.00 is often the only firmware version that works correctly with MakeMKV and VLC integration. The process typically involves:
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