Flint 3 - no secondary wifi after fw update

Dears,

my Flint 3 is configured with two wifi networks; the main one, spreaded over 2,4, 5 and 6 GHz, and a secondary one used by IoT devices, 2,4G only (Amazon Echoes, zigbee controller and so on).

These wifis have been assigned to different VLANs, if this might be relevant to troubleshoot.

Yesterday I accessed the Flint 3 to forward a couple of ports and noticed a FW update was available; I updated, but after that I can’t see the secondary wifi anymore.

Obviously from the admin panel I see the secondary wifi is active; tried to turn it off and then reactivate, tried to reboot… nothing worked for me. Tried also to switch offf & on the SSID visibility, but without results.

Is this a known bug? It seems the update broke my wlan interface. Can you help me troubleshooting?

Btw: I have my configuration saved (apart from WLANs, there are three VLAN configured by means of LuCI scripts) and a last chance would be to revert my FW release and upload my config, but before doing anything, I’d like to hear suggestions from you experts (I’m not a network guru, unfortunately).