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Hey Coopervid, am also interested in the BDR-UD03 flashing instructions. My drive is also a Verbatim branded Pioneer:

Drive Information
OS device name: \Device\CdRom1
Current profile: BD-ROM
Manufacturer: PIONEER
Product: BD-RW BDR-UD03
Revision: 1.14
Serial number: lol
Firmware date: 2020-06 ...

Hey Coopervid, am also interested in the BDR-UD03 flashing instructions. My drive is also a Verbatim branded Pioneer:

Drive Information
OS device name: \Device\CdRom1
Current profile: BD-ROM
Manufacturer: PIONEER
Product: BD-RW BDR-UD03
Revision: 1.14
Serial number: lol
Firmware date: 2020-06-15 ...