I have a Shelly Plug here and want to update the firmware (from 20191018-113038/master@b12f42e3 to 20201228-092942/v1.9.3@ad2bb4e3).
Unfortunately I have some critical infrastructure connected to it, so I don't want to turn it off/on 
If I set the Power on default mode to "Restore Last Mode", will it powercycle during the firmware upgrade?
I only have one of those so I cannot test it elsewhere 
I could test with a Plug S or a Shelly 1, but its not the same I guess...
Thx,
Kai
Yeah well, I tested with a Plug S:
- set Plug S to "on"
- set power on default mode to "Restore Last Mode"
- Hit "Reset device"
- Plug S stays on during boot 
Now for the firmware-upgrade:
- set Plug S to "on"
- set power on default mode to "Restore Last Mode"
- Hit "Upgrade firmware"
- Click! Plug S shuts off during boot 
Oh my, I now need to go shut down some things for that upgrade...
Final bit of information:
I upgraded the Shelly Plug to 1.9.3 and surprise: while the Plug S cycles the relay when upgrading
the firmware, the Shell Plug (without the S) doesn't do it. So it would have been save to just do it
