I got my hands on a (apparently bricked) uugear Vivid Unit board today. Rockchip RK3399 5 inch touchscreen. Have now managed to get the bare OS working again, except it's Debian Bullseye and there's no straightfoward upgrade path. Could be a nice #homeassistant control panel, but would be great to be able to update it. Board is a strange mix of Android and Linux stuff though.