If all you need to know is if the unit is offline or not I think you should be Ok. In the case of my 3 units, the "online/offline" mechanism seemed to still work. However, the remote unit would not respond to any changes in the expert mode configuration. I confirmed this by making a simple change and adding a "Dummy" User Digit Map. Neither one of 2 units would reboot. So if you ever need to make any changes in the future, you may be out of luck.