Click start and interrupt the power or data connection while the process completes. Important Safety Tips and Troubleshooting
Open MakeMKV. Look at the "Drive Information" panel. Note the "Firmware version." If it is 1.00, you are done. If it is higher (e.g., 1.03 or 1.14), proceed.
Before attempting any modifications, you need to know what you're working with.
The BU40N 1.00 firmware is unique because it lacks these aggressive, updated AACS 2.0 execution blocks. While it was not intentionally designed to bypass security, its code allows software tools like MakeMKV to read the volume keys directly from the disc. By flashing your drive back to firmware version 1.00, you turn an encrypted, locked-down drive into a "UHD-friendly" powerhouse capable of reading 4K discs for archiving purposes. Benefits of Downgrading to BU40N 1.00 bu40n 1.00 firmware
Choose your LG BU40N from the drop-down menu.
To understand why the 1.00 firmware is vital, you have to understand a concept called protection, which guards 4K Ultra HD Blu-ray discs. The Problem: Factory Lockdown
The table below helps you understand the key differences: Click start and interrupt the power or data
Open SDFtool Flasher as an Administrator.
Later firmware versions, like 1.04, are often described as "unfriendly" because they implement the advanced AACS2 protection, which actively prevents copying. Version 1.00, however, is the foundation for making the drive "UHD Friendly" for backup purposes. Many users have reported that after flashing to 1.00 or a patched version derived from it, MakeMKV recognizes the drive and allows for full backups of UHD media. For many new and experienced users, this is the entire reason for seeking out the 1.00 firmware.
LibreDrive is a feature integrated into MakeMKV. When a drive has "LibreDrive enabled," the software takes direct control of the drive’s firmware, bypassing the host's operating system limitations. With firmware 1.00, the BU40N achieves "LibreDrive Friendly" status, allowing it to read the raw encrypted data from any 4K disc regardless of region or AACS version. Note the "Firmware version
: The "bu40n 1.00" firmware likely corresponds to a particular device. It's essential to verify that this firmware version is compatible with your device to avoid potential issues.
Check if it says "Status: Possible, not yet enabled" or "Enabled." Step 2: Download the Clean 1.00 Firmware
Ensure your UHD disc is clean and not damaged. Also, check that you have the latest MakeMKV libaacs.dll and the KEYDB.cfg file placed in your MakeMKV data directory.
In the world of optical media ripping, the firmware version on your drive dictates exactly what the hardware is allowed to do. This comprehensive guide covers why the 1.00 firmware is highly sought after, the risks of upgrading, and how to safely manage your drive's firmware for maximum utility. What is the LG BU40N Drive?