I have the same issue. I went to https://www.armbian.com/rockpro64/
and downloaded and flashed both
Armbian_22.02.2_Rockpro64_jammy_edge_5.16.17_xfce_desktop.img
and
Armbian_22.02.2_Rockpro64_focal_current_5.15.31_cinnamon_desktop.img
both of which got stuck at the same spot. first time I waited 24 hours in case it was just being slow. but no, it just gets stuck there and won't boot.
see attached image