Just a quick Google search shows that you can install Marshmallow or Nouget on a XOOM. I don't know if that applies to yours or not. Probably not recommended if you don't feel you're technical enough.
Yes, I had heard that was possible. But when I looked into it, there was a huge warning about it. I don't remember exactly what it was. It scared me away.
I got the same "upgrade the app" notice today and I did not realize that it required ver. 2018.4 and I only have 2018.2. It now will not let me preheat the car remotely from my iPhone app. Any suggestions other than waiting until I get the 2018.4 upgrade? I know it is a first world problem but..... It is a good thing that it is not canceling anything else that is more critical to driving.
Your example could happen even without remote access to the windows.
I unfortunately have a similar issue with generally the "charging complete" message not always appearing when I use anything other than a Supercharger (which did show both msgs in my last 4 charges earlier this week)... Like you, I run only the latest version of generally-available iOS and Tesla App, and I've tried uninstalling/reinstalling the Tesla App, as well as turning off each of the notification settings and turning them back on with even manually terminating the app in-between changes. Despite ensuring the Tesla App is always running in the background, I still have the inconsistent problem sometimes receiving only one or the other charging message when charging at home -- e.g. my MS is plugged-in and automatic charging to top-it-off began a little while ago at midnight, but I only received the completion notice despite having the setting for both. I can't attest to exactly when the problem for me began, but it's within the past few weeks -- before that notices worked very consistently.
