Hi,
I have a thought, I am not sure it will solve the problem, but I wonder what would happen if you change the time zone on the router to say the Eastern US, if this would have any effect on the channels displayed. This wouldn't fix the problem but if the higher 5 GHz channels are then available, you would know the glitch is definitely firmware. I picked the Eastern US because I know that works on my A-1 V1.04. Worth a try anyway. Good luck