@HA4g3n 

Hey,

EAP620 is a new model fully adapted to SDN controller, and was just released late last year. So I think they will keep support on it.

As for the firmware, you can look at the back label of your own device to check its version. I guess it's EU version in SE. You can go to their global website for the firmware upgrade:

https://www.tp-link.com/en/support/download/eap620-hd/v1/#Firmware

I use one controller to manage different models of EAP and omada gateways and switches at different site without problem until now. I think you don't need to worry about it. And I think their support team is very helpful. They helped me resolve some issues very efficiently.

@HA4g3n 

You can downlowd a Beta update, you find a link in this post.

https://community.tp-link.com/en/business/forum/topic/267736?page=2

This update have support for dynamic VLAN, DFS Channel and OFDMA , 

@shberge Thanks :)