Firmware 4.6.4 broken

[admon]

It's a known bug while upgrading. You can easily fix it:

Slate AX Wireless Section inaccessible "Unknown error occurred" since updating

Thanks for your feedback. Please try to execute these commands in the SSH: uci set wireless.default_radio0.ifname='wlan1' uci set wireless.default_radio1.ifname='wlan0' uci set wireless.guest5g.ifname='wlan1-1' uci set wireless.guest2g.ifname='wlan0-1' uci commit wireless reboot