www.makemkv.com

No! Don't flash it, as Billy and Marty wrote.

The newer firmware for the WH16NS40 is for the drives younger than 2015 and with platform MT1959. Not for the old platform MT1939.

The first of the two I bought contains a BW-16D1HT, S/N starts with TDC an was built in December 2025.
The second I will check later of the day. I assume, it will be the same.

I have two brand new at home since yesterday. Good deal from German online shop. Will check today after work, I'm curious which drives are inside.

So it came with native firmware 1.00 I assume. Great. If you'll have issues with some discs try 1.03MK. Without problems you can let the firmware as it is.

Ah, ok, right!

Nothing really helps, I can't reflash the drive anymore. At least it still reads regular Blu-rays, so it's not completely dead yet. Is it possible that the drive is having problems because it's not getting enough power via USB? Then regular Blu-rays would probably have the same problems, right? I'm...

Weird. The BU40N has not the same power issue like the Pioneer BDR-UD03 / UD04. Which USB port do you use? I don't know about another flashing related solution. Perhaps Marty can help. The MakeMKV drive information before the first flash could be useful. But you've made no copy of the origin screen,...

Try recovery mode.

In the first selection menu choose the BP60 1.00 and in the second the BU40N 1.03MK.

Or try to flash to BP60 1.02MK and after this to BU40N 1.03MK.

Marty's firmware pack is to find here. Check inside the first post.

In the past I had a BP55EB40, built April or May 2016. MT1959 and go..... and bricked because there was no BU40N inside but a BU20N.

When in doubt, open and look, then you are on the safe side, imo.

Thanks a lot for that info. I've selled the drive meanwhile but it's very good to know.

Let it be.

Independend to the chip it's a MT-1939 as MakeMKV shows and no drive with production year 2014 is compatible for flashing.

Please post the MakeMKV drive info.

The BU40N / BU50N 1.00 is the original LG firmware and is nativly 4K friendly.

Advantage: You can use other tools like DVDFab also.

Disadvantage (in my opinion): The 1.03MK has less problems with difficult discs.

PMs sent. Feel free to post info here if you need help. I don't think it's okay if you get involved when Billy has already offered. Have you ever seen Coopervid, who also releases the firmware for free, interfere if Billy is already active? Or vice versa? One user asks, one of them reacts and is go...