OpenWRT wifi extender with cable

Hi!
There are two routers on OpenWRT. One of them is connected to the Internet and has wifi access points in two bands 2.4 and 5 GHz with ssid ssidname2.4 and ssidname5. I need to connect the second router via Ethernet. It has only 2.4 GHz wifi. I need to make the two routers via Ethernet to join into one network. The two routers have the same ssid 2.4 GHz. And that the wifi would be extended via Ethernet and not as usual via wifi signal to maximize performance. I searched the internet for instructions, I couldn't find any. The official instructions from OpenWRT do not suit me because they describe the expansion of coverage through wifi. Could you give me a link to the instructions or tell me step by step how to do it?

thank you in advance!

The term you are looking for is "dump ap".
The second device is connected via it's lan ports and you disable firewall and dhcp. That's mostly is it.

See https://openwrt.org/docs/guide-user/network/wifi/wifiextenders/bridgedap#wireless_access_point_-_dumb_access_point

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and how to set up wifi? so that the devices switch depending on the signal strength and have the same ssid? The instructions say that the router dumb ap connects to a router without wifi, but has Internet access and is connected to each other via a cable.

You set the ssid with the same options on both devices?
As usually the wifi interface is bridged to the default bridge or set to bridge to the defined network?
Have you read the wiki page?

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roughly along these lines.

I did it this way: in dumb AP I wrote ip address 192.168.1.2, disabled dhcp (ignore interface on lan), firewall (Startup>disable), dnsmasq (Startup>disable). I configured AP with the same SSID, password, enabled fast transmission as main router. I set the channel different from the main router. I set TX power less so that APs would not interfere with each other.

Sorry dude, but I'm new at this.

Then please share the config files (network and wireless) of both AP.