www.makemkv.com

I have one Windows system that is working fine with a WH16NS40 drive to rip 4k media.
Another drive that I purchased about 1 year ago for another system has stopped working.
When 4K media is inserted, it just says "No Disc".

I just purchased a replacement drive and it exhibits the same behavior with 4K discs.
Ripping a bluray seems fine.

I can't figure out what else can prevent the new drive from working unless it just happens to be defective.

Drive Information
OS device name: F:
Manufacturer: HL-DT-ST
Product: BD-RE WH16NS 40
Revision: 1.05
Serial number: KLNN74E3735
Firmware date: 2120-05-06 14:40
Bus encryption flags: 17
Highest AACS version: 81
LibreDrive Information
Status: Possible (with patched firmware)
Drive platform: MT 1959
Harware support: Yes
Firmware support: No
Firmware type: Original (patched version available)
Firmware version: 1.05
DVD all regions: Possible (with patched firmware)
BD raw data read: Possible (with patched firmware)
BD raw metadata read: Possible (with patched firmware)
Unrestricted read speed: Possible (with patched firmware)

It really helps to download the MKV firmware

Yeah you have to flash the firmware
See guide below or email me or Marty for an automated flasher