I am facing same issue which has been discussed in this thread (Help in unbricking TP-Link Archer C60 V3), but as the thread is closed, I was not able to put a comment.
The issue is fixed by adrianschmutzler already but the link he provided in his answer is not available to download now.
Help in unbricking TP-Link Archer C60 V3 - #21 by adrianschmutzler
I need the same OEM firmware https://www.adrianschmutzler.net/upload/c60v3final.zip