Thanks.  Do you mean restore factory default settings?  I was hoping to avoid that because of the inconvenience of having to set up things on my LAN again, e.g. port forwarding, etc.  Seems odd that there isn't another way to remove devices that no longer exist.

Is there not a better way to do this? It would seem to be a pain to have to reset my router every time I want to upgrade a device while keeping the prior static IP.

@lyndbbacon Same issue here in archer AX6000

looking for another method other than factory resetting the router - to remove devices from being in "Permanent" status?

Is there some action I need to do from the device? or from the router? something not in the UI?

Whats the solution?

@lyndbbacon 

I have same problem but there is a way to do it without the need to reset the device:
 

- Add the device in the reserved list with the IP marked as "Permanent".

- Delete device from the reserved list.

problem solved :-)