Hi. I've compiled my own image of version OpenWrt 18.06-SNAPSHOT r7350-4fa4b5edaf.
I added files the openwrt directory, under the folder 'files' so that I do not need any configuration to be connected to the internet. I do not add any wireless configuration.
When I turn on the wireless manually under LuCI, the WiFi led do not light up.
There is no WiFi led under system -> led configuration.
Rebooting the router after enabling wireless does not help.
Weird. Used to worke, I noticed the weird morking-on-master-but-not-on-18.06 behavior some months ago. I didn't had updated my router since (switched to another model) sorry for the confusion.