AC87R / AC87U 2.4GHz Hardware Repair

I have an AC87R unit that has a nonfunctioning 2.4GHz band. I cannot log in to the router after the initial setup as the ASUS login page is grayed out and contains a message along the lines of "you've got ASUS firmware on a non ASUS product". Another post mentions this is due to the 2.4GHz band driver failing to load.

I'd like to attempt a repair but would like some guidance. I've fixed obviously broken electronics before (ie. broken solder connections, fried capacitors). Can anyone...

AC87R / AC87U 2.4GHz Hardware Repair