How to make a clean install without any problems

Hello! I want to install OpenWRT on my D-Link DIR-645 A1. I did it before, but there were problems popping up often. I would like to make a clean install without any conflict between my OpenWRT router and my main router. My main router is a TP-Link Archer C7.
Another question: does OpenWRT have WDS?


How are these two routers connected?
OpenWrt supports WDS, but not all chips are supported. Usually it works in Atheros.

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It has a Ralink RT2860v2 chip for the networking.

Is this chip supported?

No idea, I guess you'll have to give it a try.