Replacement WH16NS40 drive not working

[curiousMonkey]

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)

[curiousMonkey]

It really helps to download the MKV firmware

[Billycar11]

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