You can try firmware recovery in this thread: https://community.tp-link.com/en/business/forum/topic/270472

Omada SDN is developed by TP-Link, while QNAP is another vendor.....

@J_Bob Is this your topology? Which port is connected to AP? Is your Meraki switch's port trunk or not? And do you configure SSID VLANs on APs? Does your router have VLAN interfaces settings? It...

Theoretically it will work, but the performance depends on your wireless environment, after all, they are connected through the wireless signal. You can fix APs on different channels to avoid overlap.

Which one is the EAP225-wall? Try connecting it to office-switch-2, the same switch that OC300 connects to, and see if things will be better.

@Stephen2021 Wall editions don't support fast roaming either. Even if you enable this feature, I think it won't take effect on wall AP.