Bu40n 1.00 Firmware

MakeMKV, the most popular tool for backing up Blu-rays, features a technology called "LibreDrive." LibreDrive allows the software to take direct control of the optical drive, bypassing the traditional host authentication and region locking. However, newer firmwares (1.03, 1.04, and later) include host revocation lists that block MakeMKV’s ability to enable LibreDrive. BU40N 1.00 is the last firmware version released before these lockdowns were fully implemented. It offers full, unrestricted LibreDrive support out of the box.

“The LG BU40N on firmware version 1.00 is the most coveted revision for 4K Blu-ray ripping because LG removed UHD support after 1.02. If your drive is on 1.00 already, do not let Windows Update or LG’s tool upgrade it. If you are on newer firmware, you can force-flash back to 1.00 using a patched tool – but you need the correct BU40N_1.00.bin file from the MakeMKV forum. Keep in mind that stock 1.00 has a lower read speed cap; an alternative is to flash to 1.00-MK or 1.02-MK which fixes speed while retaining LibreDrive.”

Report on BU40N 1.00 Firmware

Introduction

The BU40N is a device that has recently received a firmware update to version 1.00. This report aims to provide an overview of the new features, changes, and improvements introduced in this update.

Summary of Changes

The BU40N 1.00 firmware update brings several key changes and enhancements to the device. These include:

Detailed Analysis

Once running 1.00, the BU40N behaves remarkably well for a slim drive:

The LG BU40N is a slim, slot-loading 9.5mm internal Blu-ray drive. It is commonly found in high-end laptops (like certain Dell XPS and Alienware models) and external enclosures (notably the LG BP60NB10). Its hardware is capable of reading the triple-layer discs (66GB and 100GB) used for 4K UHD.

However, modern firmware revisions (1.01, 1.02, 1.03, and later) contain strict AACS 2.0 (Advanced Access Content System) handshakes that prevent the drive from being used with ripping software like MakeMKV.

The BU40N 1.00 firmware represents a specific moment in optical media history—a brief window where consumer hardware met professional capability before the industry locked it down. For data hoarders, home theater enthusiasts, and digital archivists, this tiny piece of software is the difference between owning a $100 coaster maker and owning a high-performance 4K ripping machine.

If you have a BU40N drive with version 1.03 or 1.04, the downgrade process to 1.00 is safe, well-documented, and reversible. If you own a drive with 1.00 already installed, consider yourself lucky. And if you are shopping for a new drive specifically for 4K backup, seek out a vendor who can guarantee BU40N 1.00 firmware—or at least a drive capable of being flashed back to it.

The physical disc is not dead. But preserving its contents in the digital age requires the right tools. The LG BU40N running firmware 1.00 remains the gold standard.

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.

The BU40N 1.00 firmware is widely considered the "gold standard" for enthusiasts using the HL-DT-ST BD-RE BU40N (often rebranded by LG or Verbatim) to rip 4K UHD Blu-ray discs. It is preferred for its stability, wide software compatibility, and lack of the "sleep bugs" found in newer revisions. 💿 Why Version 1.00 is Significant

Most modern Blu-ray drives ship with firmware that blocks the "LibreDrive" features required to read the raw data on 4K UHD discs. Version 1.00 is a "friendly" firmware that bypasses these restrictions.

Universal Compatibility: Unlike the 1.03-MK or 1.04-MK versions, 1.00 works across multiple ripping platforms, including MakeMKV, DVDFab, and Leawo Prof. Media.

Reliable Burning: 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.

No "Sleep" Issues: Later versions sometimes cause the drive to "spin down" or stall indefinitely during a rip; 1.00 generally resumes or maintains speed more consistently. 🛠️ How to Get Version 1.00

Because most BU40N drives now ship with versions 1.01 to 1.05, users typically have to "downgrade" or "cross-flash" their hardware using community tools. 1. The Necessary Tools

SDFtool Flasher: The standard GUI-based utility used to write firmware to these drives.

DE (Direct Exposure) Firmware: You specifically need the file typically named DE_LG_BU40N_1.00.bin.

MK (Modified) Firmware: Often used as an intermediate step to "unlock" a drive that has downgrade protection. 2. The Flashing Process

is widely considered the best 4K Blu-ray drive for ripping due to its compact size and high read stability. However, modern stock firmware often blocks the ability to back up UHD discs. Downgrading to BU40N 1.00 firmware (specifically the "DE" or "Downgrade-Enabled" version) is the gold standard for restoring full LibreDrive functionality. Why Choose BU40N 1.00 Over Other Versions? While firmware like 1.03-MK is popular for general use, the DE_LG_BU40N_1.00

version is often preferred by power users for several reasons: bu40n 1.00 firmware

Broad Compatibility: Unlike some MK (MakeMKV) specific firmwares, the 1.00 DE firmware often works better with a wider range of third-party software beyond just MakeMKV.

LibreDrive Activation: It fully enables LibreDrive, allowing the drive to read data directly from the disc without the hardware-level interference common in newer versions.

Stability: Many users report that while 1.03-MK might read slightly faster initially, 1.00 is more reliable at finishing difficult rips without timeouts. How to Flash the BU40N 1.00 Firmware

If your drive arrived with a higher version (like 1.04 or 1.05), you cannot simply "update" it; you must use a specialized flasher.

The LG BU40N 1.00 firmware (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

For many years, users have sought out version 1.00 for several key reasons:

Wider Software Compatibility: Unlike the popular "MK" (MakeMKV) series firmwares, which are optimized primarily for the MakeMKV software, the original 1.00 (DE) firmware offers broader compatibility with other ripping and playback tools like DVDFab and AnyDVD.

Reliable BD-XL Burning: Some users have reported that versions newer than 1.00 (even modded ones) struggle to reliably burn 100GB BD-XL discs, making 1.00 the more stable choice for both reading and writing large media.

LibreDrive Support: Flashing to 1.00 (or a related MK version) enables LibreDrive mode, which allows software to access the raw data on the disc without the drive's internal firmware interfering or enforcing region locks and AACS bus encryption. Performance and Known Issues HL-ST-DT BU40N FR07 not working with UHD

The LG BU40N 1.00 firmware is widely considered the "gold standard" for 4K UHD ripping LibreDrive

support, which allows software like MakeMKV to bypass encrypted drive firmware and read UHD discs directly Why Use BU40N 1.00? Maximum Compatibility : It is the most reliable version for Mac and Linux users. Cross-Flashing : Many other slim drives, such as the LG BP50NB40 Archgon MD-8107S

, are "cross-flashed" with BU40N 1.00 to unlock 4K capabilities. Performance

: It provides a stable 6x read speed for UHD discs, which is often more consistent than newer 8x drives that tend to fluctuate. Flashing Guide Summary

To prepare your drive for 4K ripping, follow these general steps based on the Ultimate UHD Drives Flashing Guide

BU40N 1.00 firmware is widely considered the "gold standard" for the LG BU40N optical drive, primarily within the community of enthusiasts who digitize Ultra HD (UHD) Blu-ray discs. It is valued for its ability to bypass official restrictions, enabling what is known as "UHD Friendly" functionality across a broad range of software. Core Importance: UHD Friendly Capability

Originally, UHD Blu-rays required specific "official" hardware and software chains (like Intel SGX) to play or rip. Firmware version 1.00 for the BU40N is a "friendly" firmware that allows the drive to read the data on UHD discs without these restrictive checks. Universal Compatibility

: Unlike newer "MK" (LibreDrive) versions that often only work with

, version 1.00 is compatible with a wider array of tools, including Leawo Prof Media Reliability

: 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

: Users have reported that firmware 1.00 is more reliable for burning 100GB BD-XL discs compared to newer versions, which may suffer from bugs in the burning process. Technical Specifications & Performance Read Speeds

: The drive maintains a consistent maximum UHD read speed of

on version 1.00. While some desktop drives might burst to higher speeds, they often fluctuate, whereas the BU40N on 1.00 tends to hold its top speed longer during a rip. LibreDrive Information

: When flashed to version 1.00, software like MakeMKV will typically identify the firmware type as "Original (Unpatched)" while still enabling LibreDrive features. Flashing and Cross-Flashing

Because many BU40N drives (and rebadged versions like those from HP or Verbatim) ship with newer, encrypted firmware (e.g., 1.03 or 1.05), users often "downgrade" to 1.00. Preparation : Tools like the SDFtool Flasher are used to automate the process. Encryption Bypass

: If the current firmware is encrypted, users may first need to flash to a transition firmware like MakeMKV, the most popular tool for backing up

to remove encryption before they can successfully move to the "DE" (downgrade-enabled) version. Cross-Flashing

: Other slim drives, such as the LG BP50NB40 or BP60NB10, are frequently "cross-flashed" with BU40N 1.00 firmware to inherit its superior ripping capabilities and software compatibility. HP BU40N firmware flashing - www.makemkv.com

In the world of optical media archiving and 4K Blu-ray ripping, few topics generate as much discussion in forums like MakeMKV, Reddit, and Doom9 as the BU40N 1.00 firmware.

If you own an LG BU40N slim internal Blu-ray drive, you have likely stumbled upon warnings not to update your firmware. You may have seen cryptic references to "SVC code NS50" or "flashing to 1.00." This article is the definitive resource for understanding what this firmware version is, why it is the "Holy Grail" for ripping 4K UHD discs, and exactly how to use it safely.

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.

The LG BU40N 1.00 Go to product viewer dialog for this item.

firmware is the "gold standard" for enthusiasts looking to back up 4K UHD Blu-ray discs. It is highly sought after because it re-enables LibreDrive support, allowing software like MakeMKV to bypass encrypted disc protections and read UHD data at unrestricted speeds. 💿 Why BU40N 1.00 is Recommended

This specific version is favored over newer official firmware (like 1.01 or 1.04) or even the BP60NB10 variant:

Universal Compatibility: Works seamlessly with MakeMKV, DVDFab, and other decryption tools. Speed

: Removes manufacturer "rip locks" that slow down drive read speeds.

Cross-Flashing: It is the preferred target firmware for users "cross-flashing" other drives, such as the LG WP50NB40 Go to product viewer dialog for this item. or Go to product viewer dialog for this item. , to give them UHD capabilities. 🛠️ Common Flashing Steps

If you are looking to flash your drive to this version, the community typically follows these steps:

Preparation: Ensure you have MakeMKV installed and the latest MK Firmware Pack.

Tools: Most users use the SDFTool Flasher or the command-line flashing instructions found on the MakeMKV Forum. Process:

Flash to an "unlocked" version (like 1.03-MK) first if the drive has newer factory protection. Cross-flash to BU40N 1.00 to finalize the UHD setup. ⚠️ Critical Warnings

Power Stability: Portable LG drives are notorious for power issues; use a powered USB hub or the included "double" USB-A cable during the flash to avoid bricking the drive.

SVC Codes: 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.

Bricking Risk: Using the wrong tool or flashing in the wrong order can render the drive unresponsive.

💡 Pro Tip: If you aren't comfortable flashing yourself, you can find pre-flashed drives on sites like UHD Enabled Drives or from reputable sellers on eBay.

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.

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 “The LG BU40N on firmware version 1

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."

The Enthusiast’s Guide to the LG BU40N 1.00 Firmware If you’ve spent any time in the world of 4K data archiving or HTPCs (Home Theater PCs), you know that the LG BU40N is a legendary piece of hardware. This slim Ultra HD Blu-ray internal drive is a staple for enthusiasts, but its performance—and its most coveted features—often hinge entirely on one specific detail: Firmware version 1.00.

In this article, we’ll dive into why the 1.00 firmware is considered the "Holy Grail" for this drive, what it enables, and what you need to know about managing it. Why Version 1.00?

Most hardware manufacturers release firmware updates to fix bugs or increase security. However, in the world of optical drives, newer isn't always better for the end-user.

The BU40N shipped with version 1.00 early in its lifecycle. This specific version is "UHD-friendly," meaning it does not contain the restrictive "AACS2" protection hurdles found in later versions (like 1.01, 1.03, or 1.04). The Key Benefits:

LibreDrive Compatibility: Version 1.00 allows the drive to be used with "LibreDrive" technology. This provides direct access to the data on the disc without the drive's internal firmware interfering or "deciding" whether you’re allowed to read the data.

4K UHD Ripping: For users looking to create digital backups of their physical 4K disc collection using software like MakeMKV, the 1.00 firmware (or a "downgraded" equivalent) is essentially a requirement.

Region Freedom: It bypasses many of the hardware-level locks that prevent users from accessing media from different global regions. The "Encrypted Firmware" Problem

As LG updated the BU40N, they began implementing "encrypted" firmware. If your drive arrived with version 1.03 or higher, it likely became much harder to "flash" (re-write) the firmware back to the 1.00 state.

Newer versions often implement a "booter" update that prevents the drive from accepting older, official LG firmware files. This created a cat-and-mouse game between manufacturers and the enthusiast community, leading to the development of custom flashing tools. How to Check Your Version

Before attempting any modifications, you need to know what you're working with.

On the Sticker: The physical label on the drive often lists the manufactured date and the "ROM VER."

Via Software: Tools like MakeMKV or VSO Inspector will display the current firmware version under the "Drive Information" tab when the unit is connected to your PC. Moving Back to 1.00 (Flashing)

If your drive is on a newer, restricted version, enthusiasts often "cross-flash" or downgrade the drive.

Warning: Flashing firmware carries a risk of "bricking" (permanently breaking) your drive. Always ensure you are using the correct tools and have a stable power supply.

The community generally recommends using the "SDFTool Flasher" or the automated MakeMKV firmware pack. These tools are designed to bypass the restrictions in newer LG updates and safely install a version of the 1.00 firmware that is optimized for data extraction. Common "Flavor" of 1.00

Often, users don't flash the original factory 1.00, but rather a "clean" or patched version of it (often referred to as BU40N 1.00 MK) provided by the MakeMKV community. This version retains all the 1.00 benefits while ensuring the drive remains compatible with modern SATA-to-USB adapters. Hardware Compatibility

The BU40N is a 9.5mm slimline drive. While it is an internal laptop drive, it is most commonly used by enthusiasts in external enclosures. If you are flashing your drive to 1.00, ensure your USB enclosure uses a high-quality bridge chip (like those from Vantec or OWC), as cheap adapters can cause the flash process to fail.

The LG BU40N 1.00 firmware is the key to unlocking the full potential of one of the best slim 4K drives ever made. Whether you are building a media server or just want to ensure your physical media is truly yours to access, staying on (or moving to) version 1.00 is the gold standard.

LG BU40N 1.00 is regarded as the premier "DE" firmware for enabling full UHD 4K ripping capability on slim LG drives, offering superior compatibility with MakeMKV over newer versions

. It facilitates cross-flashing on drives like the LG BP50NB40 and acts as a "Gold Standard" for achieving stable, high-speed UHD read performance . For technical details and flashing guides, visit MakeMKV Forum