Where to file FP6 *firmware* bugs, when phone is Murena+e/OS?

I have a FP6.
Purchased from Murena; runs e/OS v3.4-a15-20260114569178-official-FP6.
MMI cmds aren’t working; traced the issue, looks like issues with FP6 modem & RIL hardware firmware.

Where should those bugs be filed?

https://gitlab.fairphone.com? https://gitlab.e.foundation? other?

fyi: Murena support say, in this case

well, at least until they ‘lock’ the issue, shutting down any further comment/question/input: