Skip to Content
EP Logo 2024

Bu40n 1.00 Firmware May 2026

LG BU40N 1.00 firmware is widely regarded by enthusiasts as the "gold standard" for UHD-friendly optical drives. It is primarily used to cross-flash other slim LG and Archgon drives to enable LibreDrive

functionality, allowing for the ripping of 4K Ultra HD Blu-rays. Performance Review Broadest Compatibility : Unlike other firmware (such as the BP60NB10 1.00-MK), the BU40N 1.00

offers the best software compatibility across various ripping and playback tools, not just MakeMKV. Reliable Read Speeds

: Users report consistent performance, often reaching a stable 6x read speed for UHD discs, which is the maximum for slim drives. Superior Versatility

: It is the preferred choice for cross-flashing popular portable drives like the LG BP50NB40

, essentially turning budget-friendly hardware into high-end 4K rippers. LibreDrive Support

: This specific version enables permanent microcode access, bypassing restrictive AACS protections and "revocation" lists. Ease of Use & Installation Complex Process

: Flashing is not a one-step process. Most guides recommend first flashing to a "MK" (LibreDrive) firmware to remove encryption before performing a recovery cross-flash to BU40N 1.00. Community Support

: Because it is so popular, detailed walkthroughs are readily available on forums like and Reddit. Summary Table Compatibility ⭐⭐⭐⭐⭐ Best-in-class for third-party software. ⭐⭐⭐⭐⭐ Highly reliable for consistent 4K ripping. Ease of Install Requires technical knowledge and specific tools. ⭐⭐⭐⭐⭐ Unlocks UHD capabilities on much cheaper hardware. bu40n 1.00 firmware

: If you are setting up a slim portable drive for 4K media archiving, BU40N 1.00

is the definitive firmware to use. It maximizes the hardware's potential while ensuring your drive isn't locked out by future software updates. step-by-step flashing guide for a specific drive model, or do you need help finding a pre-flashed drive LG WP50NB40 Slim External Drive Flashed BU40N V1 ... - eBay

by pluto3d62. Feb 14, 2022. Look and load. This thing is excellent it has a dvd rewrite program and a movie screen. That's great .

is widely considered the "gold standard" slim optical drive for enthusiasts seeking to digitize 4K UHD Blu-ray collections. Within the community, firmware version 1.00 holds a legendary status due to its unique balance of compatibility and lack of modern restrictions. Why Firmware 1.00 is the "Holy Grail"

In the world of UHD ripping, firmware is more than just hardware instructions; it determines whether a drive can bypass "AACS2" protection.

Universal Software Compatibility: Unlike newer "MK" (MakeMKV) patched versions, the original BU40N 1.00 Go to product viewer dialog for this item.

firmware is compatible with a wider array of software, including DVDFab and Leawo Prof. Media. Newer firmwares often only work with MakeMKV.

LibreDrive Readiness: While v1.00 predates the official "LibreDrive" terminology, it is inherently friendly to the exploit. It allows the drive to provide direct access to the disc data without the drive's internal firmware attempting to verify the disc's AACS certificates, which is crucial for ripping 4K UHD discs. LG BU40N 1

Burn Quality Stability: Some users have reported that later firmwares (1.03 or 1.04), even when modified, introduce bugs when burning 100GB BD-XL triple-layer discs. Version 1.00 remains the most stable for those who still burn physical backups. Comparisons with Newer Versions Firmware 1.00 Firmware 1.03/1.04 MK UHD Ripping MakeMKV Support Fully Supported Fully Supported DVDFab Support Generally Unsupported Read Speed Standard (up to 6x) Slightly Faster in some cases Downgrade Protection Sometimes Present The Flashing Dilemma: Downgrading to 1.00

Most modern BU40N drives ship with encrypted firmwares like FR07 or 1.04, which explicitly block "downgrading" to 1.00 to prevent UHD ripping. To get back to 1.00, enthusiasts use a technique called cross-flashing.

Intermediate Flashing: Often, you cannot go directly to 1.00. Users typically flash 1.03-MK or 1.04-MK first because these modified versions "break" the downgrade protection.

The "Recover" Method: Once a modified MK firmware is installed, tools like the SDFtool Flasher or MakeMKV's internal flasher can use a "Recovery" mode to overwrite the system with the BU40N 1.00 "DE" (Data Explorer) bin file. Practical Performance Notes

Read Errors: While 1.00 is highly compatible, it can occasionally be "pickier" with dirty or scratched discs than the 1.03-MK version. If a disc fails to read on 1.00, some users temporarily flash to 1.03-MK to finish the rip.

Speed Stalls: A known quirk of the BU40N (regardless of firmware) is a tendency to stall or spin down during long 100GB rips. On v1.00, the drive usually resumes eventually, whereas newer firmware might throw a hard "scsi error."

It looks like you are referencing the firmware revision 1.00 for the LG BU40N (a slim, 9.5mm internal Blu-ray drive, often found in laptops or external enclosures).

Here is a direct development of that text string into explanations, technical context, and actionable notes. Problem: Drive is no longer detected after flash

1. The Context: What is the BU40N?

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.

Unlike "half-height" desktop drives which often offer faster write speeds and better cooling, slim drives are engineered for power efficiency and space-saving. Consequently, the firmware controlling these drives must be precisely tuned to manage laser power output within tight thermal constraints.

3. It Allows Flashing to Other Drive Models (Cross-Flashing)

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.

Conclusion

The LG BU40N firmware version 1.00 is more than just software; it is a snapshot of the drive's capabilities at the moment it left the factory. While it offers stability for standard usage, it represents a starting point. For the casual user, it works reliably out of the box. For the enthusiast, it serves as the raw material for unlocking the drive’s full potential, transforming a standard slim re-writer into a versatile tool for archiving and media consumption. Understanding one's firmware version is the first step in troubleshooting media compatibility issues or optimizing the drive for specific high-demand tasks.

Problem: Drive is no longer detected after flash

Solution: This is often a "sleeping brick." Unplug the drive from power and USB for a full 60 seconds. Plug it back in. If still dead, you may have attempted to flash 1.00 onto a drive with native 1.05+ firmware, which is not possible via standard methods.

Why is BU40N 1.00 Firmware So Special?

The short answer: LibreDrive and UHD Ripping.

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.

Firmware version 1.00 for the BU40N is the factory original release. Later updates (1.01, 1.02, 1.03, and 1.14) were pushed by LG specifically to patch these vulnerabilities. Here is what version 1.00 offers that newer firmware does not:

Prerequisites

Troubleshooting Common Errors

How to Check Your BU40N Firmware Version

Wondering if you already own a drive with the legendary BU40N 1.00 firmware? Here’s how to check:

  1. Connect your LG BU40N drive to your Windows or Linux PC.
  2. Download and install MakeMKV (the free beta is fine).
  3. Open MakeMKV and look at the left-hand "Info" panel.
  4. Under "Drive Information," locate the line that says "Firmware version."
    • If it says 1.00, congratulations. You own a unicorn.
    • If it says 1.03 or 1.04, you will likely need to downgrade.
    • If it says 1.05 or higher, proceed with extreme caution.