I just got 3 Inspelning smart plugs. Work great, except one of them is not showing a unit (kWh) for Summation delivered. Just a number. The other two show it correctly. What this does is not showing a graph for delivered kWh but a bar which is not very useful if you want to see the levels of usage.
All three of them have the same (latest) firmware installed: 0x02040045
Is there a way for me to edit the units for the “summation” entity?
Chiming in here as I’m having the same issue and would like to know a resolution, if one is found.
I had the same issue with two Inspelning smart plugs. I tried going to the device page of one of them, disabling and re-enabling it, then I pressed the “RECONFIGURE” button. This seems to have fixed the units for both of them, but which part of this “raindance” did the trick, IDK.
Coming back to aid my steps to the rain dance. A reboot of Home Assistant give my plug a kick - started reporting kWh fine after that.
Perhaps the reported units changed on firmware update?
I know for sure that the firmware updated on my two Inspelnings after I updated my HA and changed the config to add firmware updates.
I also remember that before the firmware update the summation_delivered entity was present, but had no value.
I also got a notification that allowed me to single-click fix the units on the thang retroactively. It seems this doesn’t go back to when I paired the smart plugs, but rather to when the firmware updated (at a guess).
The firmware fixed the voltage reporting, but that happened as soon as I first paired it.
I’ve just taken the smart plug out of the wall, deleted it from HA and re-paired it. The Summation Delivered has gone back to the broken state again 
Restarted HA and it’s still the same. So much for thinking I’d sorted it.
Just jumping in here to say I had exactly the same problem with a Samsung smart plug.
I went to Developer tools → States, found the entity in question, and edited the yaml.
Following a restart of HA, it picked up that the unit had changed, asked me if it should adjust the history values, and now all is working.
