Bu40n 1.00 Firmware • Confirmed & Confirmed

The LG BU40N is a 9.5mm slim internal SATA Blu-ray writer. It is part of LG’s respected "BU" series, capable of reading and writing BD-R (Blu-ray Recordable), BD-RE (Blu-ray Rewritable), DVDs, and CDs. Because of its slim profile, it became a favorite for users upgrading laptops or building custom external drives using USB enclosures.

Users report that newer firmware (1.01+) often introduces bugs when writing to triple-layer 100GB BD-XL discs, whereas 1.00 remains reliable for both reading and writing. bu40n 1.00 firmware

The firmware itself is a small piece of microcode that manages how the drive reads and writes discs. Version 1.00 is a baseline—and for many users, the key to enabling features that later updates intentionally lock away. The LG BU40N is a 9

: The original 1.00 factory firmware allows third-party software to bypass AACS 2.0 copy protection. Users report that newer firmware (1

Yes, you can re-flash to 1.04 or 1.05 using the official LG updater. However, you will lose LibreDrive again. Once you downgrade to 1.00, most users never go back.