fyi I bought the drive here: https://www.amazon.com/dp/B0CS3MY2DG




Copy and paste the MakeMKV drive info & libredrive info sections so we can have a look.BobRoberts wrote: ↑Wed Oct 29, 2025 6:53 pmI attempted to flash this 'new' BU40N drive with the firmware options that I could find in the forum, each received an error. My guess is that this drive is not the same as the other 40N versions, but of course am not sure so I have included a picture as reference. Interestingly, notice in the photo that it says the drive was manufactured 11/20/2018 even though I just purchased itIt shipped out of Maryland, so maybe they just have a mass of drives in storage there. Anyway the drive works fine with blu-rays, though it maxes out at 2.0x, and with the 0=99 regedit 3.0x, however it will not work with UHD drives without the firmware flash. Funnily the first UHD attempt was War Games
Advice on how to proceed would be welcome. If this device can be flashed to work, I'm thinking of buying a few extra as backups, as the price isn't too bad, and apparently they aren't making them anymore.
fyi I bought the drive here: https://www.amazon.com/dp/B0CS3MY2DG
[img]https://imgur.com/a/FfGeWLD{/img]


BU40N 1.03-MK is better. it is in the /old folder.BobRoberts wrote: ↑Thu Oct 30, 2025 2:05 amYou asked for the MakeMKV & LibreDrive info. Here is what it looks like after the flash:
Drive Information
OS device name: E:
Manufacturer: HL-DT-ST
Product: BD-RE BU40N
Revision: 1.04
Serial number: 811HS013514
Firmware date: 2120-05-06 11:42
Bus encryption flags: 17
Highest AACS version: 78
LibreDrive Information
Status: Enabled
Drive platform: MT1959
Firmware type: Patched (microcode access re-enabled)
Firmware version: 1.04
DVD all regions: Yes
BD raw data read: Yes
BD raw metadata read: Yes
Unrestricted read speed: Yes
No disc inserted

Max is 6.0x.BobRoberts wrote: ↑Thu Oct 30, 2025 9:33 pmSince you suggested it, I tested it![]()
Interesting to note that the date specified on the firmware is 2118... Must be some active tachyon fields in the drive!
Drive Information
OS device name: E:
Current profile: BD-ROM
Manufacturer: HL-DT-ST
Product: BD-RE BU40N
Revision: 1.03
Serial number: 811HS013514
Firmware date: 2118-10-24 19:34
Bus encryption flags: 17
Highest AACS version: 78
LibreDrive Information
Status: Enabled
Drive platform: MT1959
Firmware type: Patched (microcode access re-enabled)
Firmware version: 1.03
DVD all regions: Yes
BD raw data read: Yes
BD raw metadata read: Yes
Unrestricted read speed: Yes
The drive maxed out slightly slower with the 1.03 than the 1.04I was hoping for the '24' speed the drive states
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There are so many variables (the disc itself, dust particles, humidity etc...) that the speed you get depends on. You would note in the Ultimate Guide 2025, 1.03-MK is recommended. This is the recommendation after extensive testing but you do whatever you like.BobRoberts wrote: ↑Thu Oct 30, 2025 11:09 pmThat is what I received on the firmware mk 1.04 (note screenshot above) ... interesting the difference between 1.03 / 1.04


Nope, nothing unkind there. Just stating what is recommended (after hundreds of hours of testing) but you can use whatever firmware you like. No one can force you one way or another.BobRoberts wrote: ↑Fri Oct 31, 2025 12:50 amI trying 1.01 right now and am receiving a bit slower speeds:
I would have tried BU40N-1.00 but I did not see it in the 'old' directory:
Though it could be there.. my eyesight is very poor because of my disabilities, one of which is cataracts
I noticed you stated: 'but you do whatever you like' .. which could be interpreted as less than friendly. I reviewed what I previously posted and did not see anything unkind. I was simply sharing the performance results that I received for those that might find them useful. As a former R&D developer, I would have looked fondly upon such information. I believe in this product, which is why I purchased it yesterday, but will cease sharing further info.