Comment # 15 on bug 1187472 from Takashi Iwai

Thanks, that's a good information.  Actually this is already fixed in the
upstream subsytem, bluetooth-next.git repo
commit da68ad722e54ce86fa6f87829cf60d12201cdfaa
 Bluetooth: btqca: Don't modify firmware contents in-place

I'm rebuilding a test kernel with the backported patch in the same OBS repo,
home:tiwai:bsc1187472.  It'll be kernel-default-5.12.12-*.g43254cf.
Please give it a try later.  If this works, I'll push to stable branch.

About WiFi: you'd need to unplug the power cable, and drain the power for a
while.  (On the old laptops, we could strip down the battery easily, but it's
not trivial nowadays...)