hello @paul_nicholls,
this is a tinker board '1.2' with no emmc (rk3288 based), you can download one of the images and burn it into microsd with balenaetcher
android 12: Tinker Board R2.0 /Tinker Board S R2.0 Android 12 V0.0.3
debian 10: Tinker Board S R2.0 Debian 10 V3.0.11