Can TP-Link RE220 V3 be supported?
I tried to upload the RE220 V2 factory firmware file and it did not work.
See pic, says hardware version is V3
Seems the internal pictures are here https://fccid.io/2AXJ4RE200V5/Internal-Photos/2010TW0004-Internal-Photo-Rev01-5215726
looks like it is MT7628
Just taken delivery of one of these myself hoping to put OpenWrt onto it but mine's a V3 too. Hey ho. I can still use it with the TP-Link firmware but I'd have preferred a proper router OS. 
I can see what might be a QSPI flash on those pictures but no DDR. Wonder if it's the K with internal 8MB?
Suppose I could dismantle it to see if I can get to a serial console. Finding the time ...