I have an AiMesh with AX86U>LAN>CAT5e cable>WAN>AC86U node. Both on 386.1_2
I upgraded the node first and then the main. I then did a factory reset on both, re-added the node and manually re-added my settings.
I have smart connect enabled default settings. 2.4 & 5g are setup on to specific channels of my choosing. I am using Wireless MAC filtering to keep a couple devices on 5G and AiMesh Binding to keep a couple from roaming between node and main.
My son is the main user of the node. Gaming and streaming with no issues on AC/AX clients.
The only issue I have is that the Asus speedtest will not complete for me but not important enough to mess with it.