I have an EA6900 v1.1 that would be more useful to me with OpenWrt, however I was unable to find a build. I have no training but a lot of experience tinkering, so I figured an ASUS unit had to be similar. According to Techinfo Depot, The RT-AC68U and is extremely similar:
and there is a build available for it.
The only hardware difference I noticed is the RAM chip.
Before I solder on a serial connection and risk bricking it, I would like to hear from someone with better knowledge whether or not this is a waste of time, if it's even possible that it will work.
Broadcom driver limitations are not an issue and I understand the risks, this is more of a "because it's there" and "waste not, want not" project.