I found a tutorial on updating to Android 9.0, but will that work with Hubitat dashboards. I don't want to go through the trouble if something can work with the existing 2.6.35 Palm Tenderloin. Or can I use the existing OS version with the Imperihome app I paid for so long ago that I used to control VERA3 UI5? This think is part of our family now, just continues to work great on the inductive charger and the battery hasn't swollen as a result of the well-built inductive charger.
I'm using 8yo Amazon Kid's 7" Fire Tablets. I installed the Google Play Store APK when I first bought them for the grandkids. IIRC, there was a 2nd APK required (Google Services, maybe?) They were just gathering dust so I loaded 'Fully Kiosk' on them and a newer Fire 10. They've been HE dashboards for years now --one out in the garage in hellatious humidity.
Why don't you try it yourself? HE dashboard is just a webpage. I don't see it's time consuming or difficult to try. Creating a basic HE dashboard for testing will probably take less than 5 mins.
I have a old copy of Imperihome also. Will that control Hubitat? Company and support for that app is long gone. Was a good dashboard app though. Thanks