[v6.48.1] nRAYG-60ad x2 don't bridge

I have two nRAYG-60ad and have followed the instructions at the site.
Did the upgrade but still the two units don’t “see each other”: the wireless link doesn’t come up.
If I do a scan from station bridge, I can see the other device’s “frequency” (which I setup at 64800 MHz), the SSID and the wireless MAC address.
Is my expectation to have them automatically seeing each other a real thing or do i need to do a full configuration for a transparent bridge?
In the latter case, is there some documentation more accurate/up-to-date than the official one w/ WDS (from 2009)?