Bu40n 1.00 Firmware May 2026

Physically disconnect the drive from power (unplug SATA power or USB cable), wait 10 seconds, and reconnect.

This article is for educational purposes and digital backup of legally owned media only. Circumventing DRM may violate laws in your jurisdiction. bu40n 1.00 firmware

If your BU40N currently has firmware 1.03, 1.14, or any version higher than 1.00, you cannot simply run LG’s official updater to go back. The drive’s bootloader (flash memory controller) rejects any firmware older than the current version. Physically disconnect the drive from power (unplug SATA

Do not use LG’s official website. You need the community tools found on the MakeMKV forums (specifically the "Ultimate UHD Drives Flashing Guide" thread). If your BU40N currently has firmware 1

Most BU40Ns can be flashed directly. Connect the drive. Ensure no disc is inside.

When 4K Ultra HD Blu-ray discs were released, they came with the AACS 2.0 encryption standard. This standard was designed to be unbreakable on PC drives. However, the community discovered that certain older firmware versions on specific LG and ASUS drives had "bugs" or backdoors that allowed the drive to circumvent these restrictions.