On Which image can I test? Any   How? Go to armbian-config -> System -> Nightly and proceed. If this option is not there, defreeze upgrading   Restart and after your system is up, proceed to one of those areas:   - desktop install from armbian-config on top of CLI (any board) - set first_run_network configuration, setting ip within /boot/armbian_first_run.txt (any board except Espressobin) - kernel switching or upgrade (any board, especially Odroid XU4 NEX