Bu40n 1.00 Firmware _top_

If you are into physical media archiving, 4K Ultra HD Blu-ray ripping, or building a home media server like Plex, you have likely crossed paths with the optical drive. This slim, internal Ultra Slim Blu-ray burner is widely regarded as one of the best drives for optical media enthusiasts.

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

While newer updates focus on restricting user access under the guise of security, older or specialized firmware profiles expose the drive’s raw reading capabilities. 1. Universal Cross-Software Compatibility bu40n 1.00 firmware

Is your BU40N or in an external USB enclosure ?

Here is where it gets interesting for power users. The BU40N 1.00 firmware can sometimes be flashed onto other similar drives, such as the BH16NS55, WH16NS60, or even the ASUS BW-16D1HT (after conversion). This is because HLDS uses a common chipset across many drives. Having a copy of the BU40N 1.00 binary is essential for "downgrading" newer, locked drives to a LibreDrive-friendly state. If you are into physical media archiving, 4K

This happens when trying to overwrite a heavily protected, newer firmware version. Ensure you are using the latest version of with the "enc" option enabled to force the downgrade.

is a slim, internal/external SATA Blu-ray writer capable of reading UHD Blu-ray discs. The (dated around 2017/2018) was the initial, unpatched version of the drive's software. While newer updates focus on restricting user access

Absolutely. The Buffalo BRUHD-PU3 is an LG BU40N in disguise. In fact, many BRUHD-PU3 units shipped with firmware 1.00 from the factory, making them the most sought-after external 4K drive ever made. If you own one, never update it .

Drives with 1.00 firmware are ready to rip straight out of the box, whereas newer drives often require "cross-flashing" or patching to downgrade the firmware to a usable state.

Manufacturers frequently release firmware updates to patch vulnerabilities and enforce these restrictions. If your drive updates to a newer factory firmware (such as version 1.01, 1.02, or higher), the drive becomes locked. It will no longer allow software to access the raw data on a 4K disc.

Last updated: October 2025. Always check the MakeMKV forums for the latest flashing tools and firmware binaries, as links and methods change periodically due to hosting takedowns.