Are you having problems with your LG BU40N UHD Blu-ray Disc optical drive? For instance, if it cannot copy UHD Blu-ray Discs, or if it cannot play some UHD titles from the UHD Blu-ray Discs? In such kinds of scenarios, you simply need to do an LG BU40N firmware downgrade. You have come to the right place, as we will show you how to do the quick fix.

Part 1: Introduction to LG BU40N

The LG BU40N is an internal ultra-slim UHD Blu-ray Disc writer developed by LG electronics. It mainly features M DISC support, which is a superior data protection technology, which utilizes a rock-like recording surface instead of organic dye to etch your data onto a disc. It also features silent play, which greatly reduces the noise produced by spinning discs during playback (by automatically adjusting the playback speed according to criteria). With the LG super multi compatibility, you can easily read and write different types of disc formats in one convenient package. The read and write speeds for Blu-ray Discs are a decent 6X, while it is 8X for DVD writing speeds.


The newest LG BU40N ultra-slim Blu-ray Disc writer firmware is version 1.04. Unfortunately, this firmware version makes the device ‘unfriendly’, which is a basic term to describe the advanced AACS2 protection. Fortunately, there is a way to make the device ‘friendly’, and we will show you how to do so. This optical disc drive is compatible with Windows XP, 7, 8, 8.1 and 10. You can get this device for about $95 on eBay, Amazon, memoryC and other participating retailers.

Part 2: How to Downgrade Firmware on LG BU40N with Leawo UHD Drive Tool

Before we show you how to do the LG BU40N firmware downgrade, you need to know the purpose of doing such a task. Basically, there are predicaments for some UHD Blu-ray optical drives, including the LG BU40N 4K drive.

Predicaments of some 4K UHD Blu-ray drives

The are important things you need to know about 4K UHD drives in general. First and most important, you need to make sure that your Blu-ray Disc drive is UHD compatible. The quickest way to check is through looking at the disc drive itself (it may be labeled ‘Ultra HD Blu-ray’ or something similar). Alternatively, can also check Device Manager on Windows, which should provide you with detailed information. Second, you need to ensure that your UHD Blu-ray drive is ‘friendly’. Such kind of drives can read regular BDXL media without implementing AACS2 protection. In contrast, unfriendly drives implement AACS2 protection. AACS2 protection will prevent you to do any sort of copying, and in extreme cases it will even prevent playback of some 4K UHD Blu-ray titles. Because of these premises, UHD drive tools exist, as a way to make 4K UHD Blu-ray optical drive ‘friendly’ through firmware flashing or downgrading. Using UHD downgrader softwares is totally safe, which should assure you.

What is the best software to use for this task?

The quickest, safest and easiest method for the LG BU40N firmware downgrade task is through using Leawo UHD Drive Tool. This advanced tool is one of the few available that can do such kinds of tasks. Its flexibility allows you to read, rip, or burn the discs without any restrictions imposed by AACS2 protection. What are some of the perks, features and advantages of this software? They are as follow;

  • Leawo UHD Drive Tool
  • Leawo UHD Drive Tool

    It supports a wide range of 4K UHD drives.
    It enables you to downgrade UHD-unfriendly Firmware on Blu-ray drive to a compatible version for 4K UHD Blu-ray ripping, copying or playing via certain programs.
    It has an intuitive interface
    It can provide you with detailed information about your UHD Bu-ray drive, as well as a helpful log when you use the software.
    It supports Windows 7/8/10 and macOS 10.13/10.14/10.15/11.

To downgrade 4K UHD drives such as the LG BH16NS55 UHD, follow the steps below;

  • select-the-uhd-drive-from-the-available-list

    Step 1: Select the UHD drive from the available list. Ensure that the UHD drive is connected to your computer, then start Leawo UHD Drive Tool. Select the optical drive by clicking the downward triangle icon.

  • select-the-desired-firmware-from-the-list

    Step 2: Pick out a target firmware. Choose a firmware version from the drop-down box by clicking the Downgrade Firmware button.

  • downgrading-the-firmware

    Step 3: Downgrade the firmware. When you click continue, the firmware should begin downgrading.

Note: When the downgrading process is finished, restart your computer to make sure that your UHD drive runs smoothly and flawlessly.

Part 3: Best 4K UHD Player - Leawo Blu-ray Player

Once you have downgraded your 4K UHD optical drive with Leawo UHD Drive Tool, the next task is to look for software that can handle 4K UHD content, such as Leawo Free Blu-ray Player. This advanced media player is popularly known for providing very smooth playback for higher quality videos, and a decent amount of features that makes it one of the best competitors, among many good media players. There are many reasons why you should get this free media playback suite, which are as follow;

Follow some the steps below if you need some additional help on how to use this software.

  • Blu-ray-player

    Step 1: Load the UHD source file to the media player. Before browsing and loading the source files, make sure you have installed this lightweight media player on your PC. Then click Open File from the home interface to load the source media files to the player.

  • playback-setting

    Step 2: Set the playback options. There will be a bunch of custom features for you to use, including subtitles, audio output, snapshot, DVD Blu-ray and so on. Click the settings button to enter the window for these features.

  • play-the-movie

    Step 3: Enjoy the UHD movie playback. Click the start button to play the movie. You will be able to watch the most cinema-like movie streaming at home theater.

Here is a video guide on how to use Leawo Free Blu-ray Player:

Leawo UHD Drive tool should help you to downgrade 4K UHD drives easily, which will make playing your 4K UHD Blu-ray Discs on softwares such as Leawo Blu-ray Player possible. As discussed above, AACS2 protection technologies implemented on UHD Blu-ray optical drives, such as the LG BU40N 4K can prevent playback in some cases. Therefore, try Leawo UHD Drive today to get more out of your UHD optical drive, and try Leawo Blu-ray Player if you need the best media player.