WDR3600 LEDE 17.01.4 5GHz radio not working

Installing and Using OpenWrt Network and Wireless Configuration
1

Cant get the 5ghz radio to work.

config wifi-device 'radio1'
	option type 'mac80211'
	option hwmode '11a'
	option path 'pci0000:00/0000:00:00.0'
	option country 'GR'
	option log_level '1'
	option channel '108'
	option htmode 'HT40'

config wifi-iface
	option device 'radio1'
	option mode 'ap'
	option ssid 'OpenWrt'
	option encryption 'psk2+ccmp'
	option network 'lan'
	option key 'dadadadad'
2

108 is a DFS channel, the router must listen for DFS events (radar pulses) for 60 seconds (and if it detects a radar in range, it must switch to a different channel and start the DFS check again), before it is allowed to transmit on a DFS channel - so you just need to be patient.

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