Correct, to summarize. My master router is GT-AC5300, with 2 AC88U's as nodes. Both nodes are connected to the main router via Ethernet cables with an un-managed switch between the nodes and the master router. System was working fine with production grade firmware. I initially tried to configure the system with the beta firmware with Ethernet Backhaul enabled but never once saw a functioning mesh system. Usually the add Aimesh node wizard would stop at 60-70%. Occasionally the master router would show one Aimesh node connected, but it wouldn't last. Even devices connected to LAN ports did not show as connected. More often than not all 3 routers would stop working with a combination of freezes and spontaneous reboots. The frozen routers required paper clip in the reset hole before I could communicate with them. When I first raised the issue it was suggested that I stop restoring config files saved from production firmware and start with a fresh configuration. That had no affect. After trying with Ethernet backhaul completely disabled, I can get the system working with the AC-5300 and ONE of the 88U's, and appears to work great if I stop there. However, once I attempt to add the 2nd node, I'm back to seeing freezes and reboots. Similarly the add AiNode wizard stops at 60-70%, master router reboots, but appears fine after the reboot. the 2nd node is frozen and requires a paper clip reset. 1st node appears functional but no longer shows as a node in the hierarchy, and will not appear in the heirarchy even after waiting several minutes, or attempting to re-add. Must do factory reset on the node to re-add.Just to confirm does your problem only happen when there are more than one nodes in your network? I don't have this issue with only one node.
But even after all this, all it takes is a downgrade to production firmware, and re-adding the AI-Mesh nodes and the system springs back to life. I don't even have to restore config files or anything.
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