Can't install OpenWrt on TP-Link Archer A6 v 3.20

Installing and Using OpenWrt
8

I skimmed through the main Thread on the Archer C6/A6v3 and found this post - maybe it helps: OpenWrt Firmware for Archer c6 v3.2 - #418 by cint92

Best read the posts before and after that, too. And you do have the EU version, not CA or RU, right?