www.makemkv.com

Thank you, Billycar11.

Flashing went flawlessly on Windows 11 PC, and UHD reading works.
The only thing I hope is for these Hitachi-LG drives inside Buffalo case to last.

Thank you for clarification regarding MakeMKV.

To confirm, for a Model BH16NS58 Rev. 1.03; it is recommended to use BH16NS60-1.02

(P.S. I saw a folder for BH16NS58 with BH16NS58-1.01 in it.)

I purchased the Buffalo MediaStation BRXL-16U3 USB 3.0 External Blu-ray Drive, and drive info are follows:

Drive Information
OS device name: P:
Current profile: DVD-ROM
Manufacturer: HL-DT-ST
Product: BD-RE BH16NS58
Revision: 1.03
Serial number: KLQOBxxxxxx
Firmware date: 2120-05-08 09:33
Bus ...

I have another Asus BW-12D1S-U which seems to have Pioneer drive. It reads, plays, and writes blu-ray discs.
Is there anything that can be done to make this one to recognize UltraHD discs?

The profile info from MakeMKV are following:

Drive Information
OS device name: N:
Current profile: BD-ROM ...

Coopervid,
thank you very very much for your PM!

The drive has a UHD support now.
FYI, it worked directly, no need for 2 steps process; with the OEM enclosure connected through a USB cable to the PC.

I have Asus BD-12D1S-U with Pioneer bdr-208 fw. Is there anything that can be done to make it work to recognize UltraHD discs?

The info from MakeMKV are following:

Drive Information
OS device name: D:
Current profile: BD-ROM
Manufacturer: ASUS
Product: BW-12D1S-U
Revision: E301
Serial number ...