Hi all

I have essentially bricked my WLAN by upgrading to v2.2.1 firmware on my AX11000 (v1). 

Since the upgrade, WLAN devices cannot talk to LAN devices, or to each other. I have extensively troubleshot this; essentially the router is not passing ARP packets to/from WiFi hosts (as seen on a TCPdump); and its acting like AP isolation is turned on. It is not. I have toggled other known troublesome features including SmartConnect/OneMesh and repeatedly reset the router to flush tables. Frustratingly, you cannot roll back from 2.2.1 which was hidden in the fine print when the update was pushed.

WLAN devices can access the router and the internet. Just not the LAN. 
It is affecting multiple traffic types including HTTP, FTP and SSH.

In terms of topology, there is one unmanaged switch and two TP-link repeaters in the network, which were all working fine before the update. I have removed them and I'm now troubleshooting on a network that is basically the router and two PCs with wireless and wired NICs. 

If the WLAN NIC is enabled on a device, this behavior overrides the wired LAN and all LAN devices are inaccessible. The only way to have any LAN traffic is to disable each devices wireless NIC (if possible). 

My searching seems to suggest this is related to the "“Enhanced Broadcast Management / Isolation Enforcement” feature of 2.2.1.

If anybody has any grand solutions, or TP can facilitate a downgrade or fix, I would literally pay anything at this point.