When I first got the HyperPixel 2.1 Round it would power up but not display anything. With the help of Pimoroni support I got it working by installing the older SD card image bullseye 2022-09-06 and after that it works perfectly. The display is great and works well even with the regular gui, though of course it being round you can only see the middle of the screen area! The device and Pimoroni are highly recommended.
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