The specs for the device in question can be found here. It appears to be running a Qualcomm QCA933x chip. I am comfortable SSH'ing into the device and finding any relevant info. I think it also has internal TTL pins, which I can verify and connect to if need be. It seems like there has been quite a bit of support for Ubiquiti gear added lately so I was wondering if maybe this could also be added. Happy to contribute in any way I can. This device is EOL now and official LTS support ends in 5 days so I'm looking to switch to OpenWRT on it.
ssh / serial console is probably a good start.