I've successfully upgraded the default stretch os to buster following directions from this article or this one.

The Zumi appears to still function correctly. Anyone know of anything that buster might break?

@robolink_leila Yup, all good with the new SD card. SanDisk is the way to go!

I see this when I goto zumidashboard.ai, only the Learn option is available. How is the Code mode enabled?

Bah. So this is a fine example of why manufacturers should NOT round up when stating how big their SD memory cards are.

@robolink_leila Do you know if there's any issue if we flash this new .img onto a 32GB card and use that in the Zumi?