www.makemkv.com

As per this thread viewtopic.php?f=19&t=40461 Coopervid's advice is to "downgrade to 1.17.7 and flash BU40N 1.00." on my slim external Buffalo BRXL-PUS6U3B.

Read through the guide and will do so again. To clarify what I understand so far:

1) download SDFtool Flasher and All You Need Firmware Pack
2) flash BU40N 1.03-MK first
3) flash BU40N 1.00 next

Just a bit fuzzy on when to use write or recovery. I'm currently blaming this on a lack of coffee and sleep. Guess I'll see if there's a video tutorial out there.

Many thanks to everyone in the MakeMKV community.

Device: /dev/sr1
Manufacturer: Buffalo
Revision: BN14
Firmware date: 2121-06-21 13:33
Bus Encryption flags: 1F
Status: Possible, not yet enabled
Drive platform: MT1959

Looks good!

Thanks, Coopervid. So both times I just select the firmware and choose Write. ie, write 1.03, then write 1.00?

Hope you have a great holiday season.

Woody wrote: ↑

Mon Dec 22, 2025 5:11 pm

Thanks, Coopervid. So both times I just select the firmware and choose Write. ie, write 1.03, then write 1.00?

Hope you have a great holiday season.

Jepp! Enjoy your holiday season.

Hello, thanks for the info on this drive. I was able to pick one up and have successfully flashed it to 1.03 with the firmware in the all you need firmware pack.
I wasn't able to find the 1.00 firmware in the "all you need" pack. I did find "DE_LG BU40N_1.00.bin" in the firmware pack in this post but wasn't sure it is the correct version for the slim drive.
viewtopic.php?f=16&t=18873#p70284

kzburner wrote: ↑

Wed Dec 31, 2025 8:42 pm

Hello, thanks for the info on this drive. I was able to pick one up and have successfully flashed it to 1.03 with the firmware in the all you need firmware pack.
I wasn't able to find the 1.00 firmware in the "all you need" pack does anyone have the link for that? I did find "DE_LG BU40N_1.00.bin" in the firmware pack in this post but wasn't sure it is the correct version for the slim drive.
viewtopic.php?f=16&t=18873#p70284

Yes, that is the correct firmware.

Cheers, thanks Marty.

I just got this drive from Amazon.

new to all this flashing so bare with me please, have questions.

So what is 1.17.7 all about and do I need to downgrade to 1.17.7 and where do I even find this?

Or do I just ignore this 1.17.7 info and just start doing the following:

Flash - DE_LG_BU40N_1.03_MK.bin (first)
Flash again - DE_LG_BU40N_1.00.bin (second)

What the reason behind going to 1.03 then back to 1.00, isn't 1.00 older? why not use the newer 1.03?


Just to confirm I have the slim BRXL-PUS6U3B:
Manufacturer: BUFFALO
Revision: BN14
Firmware date: 2121-06-21 13:33
Bus encryption flags: 1F
Highest AACS version: 81

Status: Possible, not yet enabled
Drive platform: MT1959

Thank you

raymate wrote: ↑

Sat Jan 24, 2026 11:05 pm

I just got this drive from Amazon.

new to all this flashing so bare with me please, have questions.

So what is 1.17.7 all about and do I need to downgrade to 1.17.7 and where do I even find this?

Or do I just ignore this 1.17.7 info and just start doing the following:

Flash - DE_LG_BU40N_1.03_MK.bin (first)
Flash again - DE_LG_BU40N_1.00.bin (second)

What the reason behind going to 1.03 then back to 1.00, isn't 1.00 older? why not use the newer 1.03?


Just to confirm I have the slim BRXL-PUS6U3B:
Manufacturer: BUFFALO
Revision: BN14
Firmware date: 2121-06-21 13:33
Bus encryption flags: 1F
Highest AACS version: 81

Status: Possible, not yet enabled
Drive platform: MT1959

Thank you

For UHD discs, MK firmware only works with MakeMKV and Xreveal. If you use other UHD ripping software, v1.00 is what you want.

MartyMcNuts wrote: ↑

Sat Jan 24, 2026 11:32 pm

raymate wrote: ↑

Sat Jan 24, 2026 11:05 pm

I just got this drive from Amazon.

new to all this flashing so bare with me please, have questions.

So what is 1.17.7 all about and do I need to downgrade to 1.17.7 and where do I even find this?

Or do I just ignore this 1.17.7 info and just start doing the following:

Flash - DE_LG_BU40N_1.03_MK.bin (first)
Flash again - DE_LG_BU40N_1.00.bin (second)

What the reason behind going to 1.03 then back to 1.00, isn't 1.00 older? why not use the newer 1.03?


Just to confirm I have the slim BRXL-PUS6U3B:
Manufacturer: BUFFALO
Revision: BN14
Firmware date: 2121-06-21 13:33
Bus encryption flags: 1F
Highest AACS version: 81

Status: Possible, not yet enabled
Drive platform: MT1959

Thank you

For UHD discs, MK firmware only works with MakeMKV and Xreveal. If you use other UHD ripping software, v1.00 is what you want.

OK, I only use MakeMKV so i shall do the 1.03

Thank you for a fast reply

Hi all, I have the same drive and have done the above.

But I have a question: is it possible to go back to 1.03 after going to 1.00?

I tried to go back to 1.03 and SDFtool Flasher showed an error dialog as soon as I clicked "Start", it asked if I wanted to Continue or Quit. I chose Quit and looks like no damage was done. I kept a copy of the error output if anyone wants to see it. Thanks for your help.

Edit/Update (2026-01-29):
After raymate's response, I again tried flashing 1.03 to replace 1.00 (using Write mode, same as last time) and did not get the immediate error dialog this time.

My guess: a) maybe I had a disc in the drive previously, or b) the drive needed to be reconnected, perhaps it was in a weird state due to reading errors from recent MakeMKV session or was a random fluke. Flashing 1.03 completed without issue and I was able to rip.

On another note, I'll mention this post regarding another difference between using 1.00 or 1.03 with BRXL-PUS6U3B, a user claimed they could not use certain burning features on 1.03 but could on 1.00: viewtopic.php?style=4&p=162898#p162898.

houstonrocket wrote: ↑

Wed Jan 28, 2026 4:16 pm

Hi all, I have the same drive and have done the above.

But I have a question: is it possible to go back to 1.03 after going to 1.00?

I tried to go back to 1.03 and SDFtool Flasher showed an error dialog as soon as I clicked "Start", it asked if I wanted to Continue or Quit. I chose Quit and looks like no damage was done. I kept a copy of the error output if anyone wants to see it. Thanks for your help.

Yes. I flashed mine to 1.03 then to 1.00 to see what would happen. It worked fine then I flashed it back to 1.03 and all was well. Ripped about 10 discs so far after flashing it multiple times