New 12 gig board keeps rebooting, tried different kernels OS, PSU etc

Yessss !!! I got the board working.

I did flash version 2026-09-16 of the firmware:
https://dl.radxa.com/dragon/q6a/images/dragon-q6a_flat_build_wp_260916.zip

and I did install Ubuntu:

I do not know if I did mess up the bios config or did install the wrong OS. For now it seems to be okay. When i’ve got time I’ll try to get rid of the blacklisted modules and try to install an OS on UFS.