Hi, I'd just like to report that flashing the latest image through the TP-Link web admin portal seems to have worked perfectly. No errors like "Incorrect Image." However, using a renamed file --- ArcherC7v5_tp_recovery.bin --- as is recommended on the wiki did not work either through tftp or the web portal.
OpenWRT v19.07.4
openwrt-19.07.4-ath79-generic-tplink_archer-a7-v5-squashfs-factory.bin
(Using MacOS as the tftp server.)