Hi,
Not sure that this is going to help you, but I am running the same motherboard and here the software versions I've got:
Firmware Revision: 01.23.04
Firmware Build Time: 11/15/2019
BIOS Version: 1.1
BIOS Build Time: 08/14/2019
Redfish Version: 1.0.1
Thanks to Tybio post I was able to configure the motherboard to use IGPU by changing from "Auto" to "IGFX" in this bios version.
By the way, I also confirm that doing so allows for hardware transcoding with the Plex Docker, but it kills the IPMI video output. This is a small bummer but on the bright side the remote power on and power off features are still working.