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Thanks, this worked flawlessly! I used Windows 10 in Gnome Boxes and simply forwarded the USB adapter (JMicron JMS583Gen 2 to PCIe Gen3x2 Bridge) to the VM.

Result:

Drive Information
OS device name: /dev/sr1
Manufacturer: PIONEER
Product: BD-RW BDR-S11
Revision: 1.53
Serial number: OFDL ...

Thank you for all your efforts! Today I received my Pioneer drive and would also like to cross flash it in order to enable UHD support.

This is the drive information:
Drive Information
OS device name: /dev/sr2
Current profile: BD-ROM
Manufacturer: PIONEER
Product: BD-RW BDR-209D
Revision: 1.33 ...

Bought an external Verbatim BDXL driver this weekend. According to this thread I though it would work.
Unfortunately it doesn't recognize UHD disks. (It just shows "No disc").


The details:

Drive Information
OS device name: /dev/sr1
Manufacturer: PIONEER
Product: BD-RW BDR-UD03
Revision: 1.14 ...