Thank you for posting, I was bored so did a dirty upgrade from 386.3 on my AX88U. Made my network go crazy for a little, split my AiMesh into two networks which caused confusion, devices bouncing back and forth between the two networks, can't update IP messages. Router crashed a few times while I was trying to grab system logs and see if unbound or something else was going causing issues. Reinstalled unbound, redid config for unbound, restarted, factory reset AC3100 node, reconnected and installed new firmware. Seems fine now, including the AiMesh. Saved the system logs, not sure if they would be useful.
Speaking of logs, what is the command to only record important information, so I'm not reading through 'buggy' and other nonsense messages? Searched a few times, always referenced, can't find the command or option.