It seems I just hit this problem with my ER605 v1 being stuck in Adopting. I have no remote availability now to reboot it now or to upgrade or downgrade its firmware which is currently v1.2.3. Though I doubt that would even be an option if it's in Adopting mode.

I've never had this happen before until this firmware version which I upgraded to after its initial release. While we have internet connectivity I've lost any remote connectivity to it (which is how I actually found this problem) as none of the port forwarding settings are working. I'll have to physically power it off/on and hopefully it re-adopts properly where I can then think about downgrading to one of the previous versions I've used which didn't have this issue.

[-Update-]: I've powered it off and on but it still shows Adopting and I still have no remote connectivity as the port forwarding settings continue not to work. What do I do now? This has turned into an emergency support ticket now as none of our services are working now (MS Exchange). I can't even login to the device directly because it says it's managed by the Omada Controller (v5.9.31[).

[-Update 2-]: There may be deeper problems. I just discovered that after resetting the device to factory and re-adopting in Omada with the exact same configuration also resolved my problem where I couldn't connect to one of my devices externally. I'll have to keep an eye on whether this too reappears in the future with this firmware.