: Community stress tests have shown that while newer versions like 1.04 are often "rubbish" and prone to errors, 1.00 remains stable for long-term use. Burning Support
The BU40N holds a specific place in the enthusiast community (notably on forums like MyCE or VideoHelp) because of its potential for customization. The 1.00 firmware is often the target for modification. bu40n 1.00 firmware
: Check the label on the bottom of your drive. Certain service codes (like NB72 ) may have hardware locks that prevent successful UHD reading even after flashing. : Community stress tests have shown that while
The (specifically the "Downgrade Enabled" or "DE" version) is considered the "gold standard" for enthusiasts who rip 4K Ultra HD (UHD) Blu-rays. While newer official firmwares (1.01–1.05) often block unauthorized reading of UHD discs to satisfy DRM requirements, the 1.00 DE firmware removes these restrictions, turning the BU40N into a "UHD-friendly" drive. Why Firmware 1.00 is Recommended : Check the label on the bottom of your drive
The problem is that LG, under pressure from the AACS (Advanced Access Content System) licensing body, locked down the drive’s firmware. Stock firmwares beyond version 1.03 intentionally cripple the drive’s ability to work with ripping software like MakeMKV or AnyDVD HD. is the “golden key” that restores the drive’s full, unfiltered potential.
Disclaimer: Flashing firmware carries a risk of bricking your drive (making it unusable). Proceed at your own risk. This guide assumes you have a BU40N with SVC Code NS50 (check the sticker on the drive).