Use RT-AC68U build on Linksys EA6900

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:

Techinfo Depot EA6900 v1.1

Techinfo Depot RT-AC68U

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.

I would recommend booting the image directly from RAM instead of overwriting the stock image. Most devices can sideload (yes, as in Android) an ARM FitImage. Once booted, you can research the kernel boot log to see any error or warning it may issue.

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Excellent! Thanks for the quick reply. I've never needed to do a sideload, but I've read several tutorials, so it will be an interesting learning experience. Now that I see where it's useful in this situation, I feel like I should have done it more often in the past.

Even if you flashed OpenWrt successfully, WiFi would be useless because there is no FOSS driver available for BCM4360.

He is aware of that: