I bought the TP-Link Archer C20 V4, Installed openwrt and tried it out. It is unfortunately not working out for me. The primary issues being,
No support for 5GHz wifi
I have been trying to figure out a way to set it up as a 2.4 Ghz range extender and it's extremely confusing how all of it works.
So, Now I would like to go back to stock firmware. From what I have read so far, I can't simply flash stock firmware over tftp. I need a stripped firmware. I have tried to find a stripped firmware of archer c20 v4 and have came up empty.