You take any cheap 20$ China Raspberry hat and there is a 2-Page manual (in bad english) that gets you up toggling your inputs and outputs in like 20 minutes.
I have now been digging for at least a solid 5 to 8 hours in the unorganized pile of stuff available here. Best I have found out now is Unipi 1.1 is outdated and abondoned. Existing docs do not mention all the things that are unimplemented.
I will now just throw away the board and not sink any more time in it.