~~I'm guessing you were in a Home Assistant core installation?~~ EDIT: Just saw that it's supervised as well. I'm not sure why you can't update it from the web ui?
I've been using a RPI 2B in a Home Assistant Supervised installation for the past two years with absolutely no problem. I can update it from the Web UI properly. The only things I noticed:
- you sometime get a "unsupported hardware" notification that you can dismiss. Just keep in mind that since this isn't a "supported" platform, you shouldn't bother the devs with hardware related problems should you have any. As I said, I never had any problem and I'm running many addons/integrations.
- I wonder if sometimes zigbee2mqtt may be slow due to the hardware. Nothing too problematic, but I might upgrade hardware in the future to check that