The safest and most common way to get version 1.00 capability today is using community-designed GUI flashers (such as the ASUS ODD Flasher modified for LG drives or the built-in command-line tools in specialized flashing packages).
If your drive currently has a higher version (like 1.01, 1.02, or 1.05), you may need to follow specific steps to "downgrade" back to 1.00: Encrypted Firmware
Ensure your laptop is plugged into a power source, or your external drive enclosure has a stable USB connection. Do not move the cable during the process.
If you are hunting for the , you are likely trying to enable UHD Blu-ray ripping capabilities—a process often referred to in the tech community as making the drive "friendly." This comprehensive guide covers what the BU40N 1.00 firmware is, why it is highly sought after, how it impacts UHD data archiving, and how to safely manage your drive’s software. What is the LG BU40N Drive? bu40n 1.00 firmware
However, the drive's potential is heavily dependent on its firmware. Newer firmware versions (1.01 and above) implement stricter encryption and AACS (Advanced Access Content System) protections, purposefully limiting the drive’s ability to read UHD Blu-ray discs and making it non-compatible with key tools like MakeMKV.
If your BU40N is in an external enclosure, plug it directly into a motherboard USB port. Do not use an unpowered USB hub, as unstable voltage can cause flash failures.
Direct you to the on the MakeMKV forum.
If using the BU40N externally, choose a high-quality slim enclosure (like those from Vantec or OWC) that provides stable power delivery. Insufficient power over a cheap USB cable can cause read errors.
Later firmware updates (1.01, 1.02, 1.03, and especially 1.04) were designed by LG to patch the "loophole" that allowed reading the encrypted 4K disc keys. Version 1.00 retains the original, unlocked behavior.
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 safest and most common way to get version 1
Download and install (the industry-standard tool for disc backups). Insert your LG BU40N drive into your computer system. Open MakeMKV and look at the right-hand information panel. Locate the line labeled Firmware version .
: If you are setting up a slim portable drive for 4K media archiving, BU40N 1.00
The BU40N 1.00 firmware refers to a specific version of firmware designed for a particular device, likely a piece of networking or computing equipment, given the nomenclature. Firmware is essentially software that is embedded in a hardware device, controlling its functions and operations. The "BU40N" could refer to a model or series of devices, and "1.00" signifies the version number of the firmware. If you are hunting for the , you
If you're looking for information on this specific firmware version, here are a few general points you might be interested in: