OPENwrt is the only firmware I could find to replace the factory one which was totally unusable in America being that the original was more based on a china configuration and very limited options base.
DDWRT does not have firmware for anything that I have that uses N or AC hardware, I need faster and longer range to cover a 50-foot distance.
I did get the openwrt to diagnose from inside its menus after a reboot and reset. The ETH is on a 1.254 ip but the WIFI links get a DHCP from the primary network bridged via wireless.
So now to try this with the Cisco RV340 Router 192.168.99.1 and see if it works as expected. But it got late so had to do that later as I fell asleep.
I was able to pick a few ideas from the links but the links that looked like what I should do which broke openwrt so I had to revert back to what worked.
What I tried to setup was https://oldwiki.archive.openwrt.org/doc/howto/clientmode to not have so many hops or changing IPs.
So I will update when I get that part.