Ultimate UHD Drives Flashing Guide Updated 2025

[Th3Color]

Hello all,

I have a problem in that my drive simply won't work with 4K discs. It reads all other types, but not 4K discs.
It also disconnects from the PC briefly every time it tries to read the disc. Could this be another problem? However, this only happens with 4K discs.

Here is the mkv information:
Drive Information
OS device name: E:
Manufacturer: HL-DT-ST
Product: BD-RE BU40N
Revision: 1.03
Serial number: MO9P6390032
Firmware date: 2118-10-24 19:34
Bus encryption flags: 17
Highest AACS version: 18

LibreDrive Information
Status: Enabled
Drive platform: MT1959
Firmware type: Patched (microcode access re-enabled)
Firmware version: 1.03
DVD all regions: Yes
BD raw data read: Yes
BD raw metadata read: Yes
Unrestricted read speed: Yes

[MartyMcNuts]

Hello all,

I have a problem in that my drive simply won't work with 4K discs. It reads all other types, but not 4K discs.
It also disconnects from the PC briefly every time it tries to read the disc. Could this be another problem? However, this only happens with 4K discs.

Here is the mkv information:
Drive Information
OS device name: E:
Manufacturer: HL-DT-ST
Product: BD-RE BU40N
Revision: 1.03
Serial number: MO9P6390032
Firmware date: 2118-10-24 19:34
Bus encryption flags: 17
Highest AACS version: 18

LibreDrive Information
Status: Enabled
Drive platform: MT1959
Firmware type: Patched (microcode access re-enabled)
Firmware version: 1.03
DVD all regions: Yes
BD raw data read: Yes
BD raw metadata read: Yes
Unrestricted read speed: Yes

Probably not getting enough power. Use ports direct from the motherboard (USB-C if possible, otherwise USB-A 3+) or an AC self-powered hub of at least 30w. Do not use case ports.