You might be able to put DD-WRT on the TP-LINK Archer C9

But their router database doesn’t list the C9, or it has some other model number, I don’t know. There’s a post about it, didn’t see any links, but it’s a long thread, not looking at every page.

According to their wiki it is supported. Where’s the download link?

You can find the download on their FTP site.

If I get that router, I probably won’t put DD-WRT on it. Don’t do much with a router.