BU40N not reading UHD disk after flashing

[lewjh]

My first attempt at flashing and then ripping has hit a problem and I'm hoping for some help. I flashed my new drive and have ripped a regular blu ray but makemkv is unable to read my 4k discs (it tries to read then ejects). Do I need to flash to a different firmware?

Drive Information
OS device name: /dev/rdisk3
Current profile: BD-ROM
Manufacturer: HL-DT-ST
Product: BD-RE BU40N
Revision: U100
Serial number: MZFKCT91811
Firmware date: 2119-10-16 10:36
Bus encryption flags: 1F
Highest AACS version: 63

LibreDrive Information
Status: Enabled
Drive platform: MT1959
Firmware type: Patched (microcode access re-enabled)
Firmware version: 0.U1003
DVD all regions: Yes
BD raw data read: Yes
BD raw metadata read: Yes
Unrestricted read speed: Yes

[Billycar11]

Idk maybe follow my guides recommend firmware

[dcoke22]

viewtopic.php?f=16&t=19634 <--- UHD Drives Flashing Guide

[lewjh]

fair point. I got confused about which Firmware to employ. working well now. Thanks for all of your work here