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I meet with the same problem. I take gl-ar750s-3.006-1104.tar firmware and start with clean configuration: the problem remains. A750S prefectly uses 2.4GHz Wi-Fi as WAN, but fails to use 5GHz WiFi as WAN. I have saved config and logs. Here is my /etc/wireless:

config wifi-device ‘radio0’
option type ‘mac80211’
option channel ‘36’
option hwmode ‘11a’
option path ‘pci0000:00/0000:00:00.0’
option doth ‘0’
option txpower ‘20’
option band ‘5G’
option disabled ‘0’
option legacy_rates ‘1’
option country ‘RU’
option org_htmode ‘VHT80’

config wifi-iface ‘default_radio0’
option device ‘radio0’
option network ‘lan’
option mode ‘ap’
option encryption ‘psk-mixed’
option ifname ‘wlan0’
option wds ‘1’
option ssid ‘bordeaux_tr5g’
option key ‘XXX’

config wifi-device ‘radio1’
option type ‘mac80211’
option hwmode ‘11g’
option path ‘platform/qca956x_wmac’
option txpower ‘20’
option noscan ‘1’
option htmode ‘HT40’
option band ‘2G’
option disabled ‘0’
option channel ‘13’

config wifi-iface ‘default_radio1’
option device ‘radio1’
option network ‘lan’
option mode ‘ap’
option encryption ‘psk-mixed’
option wds ‘1’
option ifname ‘wlan1’
option ssid ‘bordeaux_tr’
option key ‘XXX’

config wifi-iface ‘sta’
option network ‘wwan’
option mode ‘sta’
option ifname ‘wlan-sta’
option encryption ‘psk2’
option key ‘XXX’
option disabled ‘0’
option ssid ‘bordeaux_5G’
option gl_bssid ‘64:09:80:73:D8:38’
option channel ‘36’
option bssid ‘64:09:80:73:D8:38’
option device ‘radio0’