The router is brand new.
The problem is NO WLAN exist .
I did the netinstall and upgrade nothing change.
see the photo bellow
PLs advice.
Try connect via IP adress to rb711
Nothing change. still WLAN not exist.
And before upgrading to 5.20?
Can you paste a System > Resources > PCI Snapshot?
Also you can try to downgrade it to a previus version, or to upgrade it to v6 RC.
But it seems to be a hardware issue…
I would RMA the board. You might also want to contact support@mikrotik.com