So I tried ASUSwrt-Merlin and that didn't improve the situation. I could still only select Auto, 149, 153, 157, 161, 165
Now, I'm using DD-WRT Brainslayer, and now my OP3 can see the ASUS on 5GHz (also I discovered my old Lenovo T510 can see 5GHz Wifi). The DD-WRT firmware only goes up to...