QCN9274 Wallys DR9274-5G&6G failed to fetch board data

[sebastian.arnhold at posteo.de]

Hello,

I am suffering from a nasty bug that prevents me from using my QCN9274 
Wifi card. The ath12k driver fails to load with error message: "failed 
to fetch board data for bus=pci,qmi-chip-id=0,qmi-board-id=255 from 
ath12k/QCN9274/hw2.0/board-2.bin"

I have reported it on Bugzilla and was told that "[my] device does not 
have board-id (0xff)" and that I should "encode [my] bdf to board-2.bin 
or use directly as board.bin".

Sadly, I have no idea on how to do this. Since I can't use my Wifi card 
without solving this problem, I asked them for help, but was instead 
referred here.

Can anyone help me solve this?

The complete conversation including a datasheet for the wifi card can be 
found in the aforementioned bug report, comment no. 7: 
https://bugzilla.kernel.org/show_bug.cgi?id=217971#c7

Thanks,
Sebastian