Regarding the "This NanoPi model is currently not supported."
Looks like this is a mistake in WiringNP/wiringPi/boardtype_friendlyelec.c or
As Lope wrote above, I looked at the /proc/cpuinfo and fix it by changing h3_kernel4 in mentioned file accordingly:
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int getBoardType(BoardHardwareInfo** retBoardInfo){
.....
// const char* h3_kernel4 = "Allwinnersun8iFamily"; // originsl
const char* h3_kernel4 = "Allwinner sun8i Family"; // changed
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