Tu masz przykładowy config, żeby było okey luci ma z tym problem ;-)
vim /etc/config/wirelessconfig wifi-device 'radio0'
option type 'mac80211'
option channel '6' #channel of your choice
option hwmode '11g'
option path '1e140000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0'
option htmode 'HT40' #you can change this
option disabled '0'
config wifi-iface 'default_radio0'
option device 'radio0'
option network 'lan'
option mode 'ap'
option ssid 'yourSSID'
option encryption 'psk2+ccmp'
option key 'yourPassword'
config wifi-device 'radio1'
option type 'mac80211'
option channel '40' #channel of your choice
option hwmode '11a'
option path '1e140000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0+1'
option htmode 'VHT80' #same here
option disabled '0'
config wifi-iface 'default_radio1'
option device 'radio1'
option network 'lan'
option mode 'ap'
option ssid 'SSID5'
option encryption 'psk2+ccmp'
option key 'password'