TP-Link Archer A7 - Revert to Stock Firmware failed

Hi all, I took a try on the snapshot with TP-Link Archer A7 v5 (stable not available AFAIK), but was not happy with the wireless speed (at least halved compared to stock firmware). So I would like to move back to stock.

I have read many times how to revert, on different websites and also here, specifically for TP-Link routers. I followed the TFTP recovery steps - downloaded Archer A7 the official .bin, rename it to ArcherC7v5_tp_recovery.bin (as per https://openwrt.org/toh/hwdata/tp-link/tp-link_archer_a7_v5), turn on recovery mode (WPS LED was on), TFTP to the router with fixed IP 192.168.0.66, and saw a spike in the outbound network graph. But the router kept on booting up OpenWrt.

Have I missed a step or done something wrong?