I've recently tried to set up a new AC66U_B1 as an Aimesh node in my network (in fact, I tried two different ones).
Would not work no matter what I did:
- wired, wireless, Merlin firmware, old Merlin firmware, Official firmware, older Official firmware, on the Main router (AC86U) and the AC66U_B1 node. WebGUI and App.
- I tried WPS resetting, connecting and searching from the node (two different pathways in the GUI;
1. pressing "Aimesh-node" from the main page, then "Search" in the window that pops up on the right. and then
2: Clicking "Aimesh" on the right menu and then "+ Add Aimesh") setting it up as an Aimesh router on the AC66U_B1 node
Couldn't get it to work for the life of me!
It just spun around searching for the Aimesh node until timeout, again and again and ag... Enormously frustrating and a lot of time wasted. I remember searching the forum and finding others also reporting the same issues with AC66U_B1, but no solution.
The only thing I did not try because of limitations in my physical location, was to WPS reset the main AC86U router, because this would mean a LOT of hassle. So you might try this.
I had to resort to getting a hold of an AC68U instead, and it was successfully found & connected right away. So it's clearly an AC66U_B1 specific issue. This leads me to the conclusion that the Aimesh node setup is completely broken on the AC66U_B1.
The weird thing is that I do have an AC66U_B1 that I paired in the same network about a year ago, and it is still working today, which is part of why I don't want to WPS reset the AC86U main router as I cannot afford to loose the working AC66U_B1 node not getting to detect it again. I remember I had to retry a lot of times when I initially set it up tho, using wired connection). That's why I couldn't figure out for the life of me why it wouldn't work even with older firmware. I do not know exactly which version I had, but probably the newest 1 year ago. I tried going farther back in the firmware versions than this, but to no avail.
I also tried setting the AC66U_B1 up on an AX88U main router on a different network - but it wouldn't pair there either!
I tried reporting it in the Official firmware Feedback page, but since nothing was detected, I guess there was nothing to report (no log entry).
The only suggestion I have is either
1. Try a very old firmware and see if it gets connected successfully. If it does, your can upgrade the firmware and the pairing settings will stick when you upgrade to the newest firmware.
2. Contact Asus customer service and work things out. Refer them to this post and other forum posts you find with the same problem.
Remember to give us feedback on how it goes!