Can I indifferently load one or the other of those firmware, or just a specific one ?
Until NanoVNA-H4 (AKA HW version 3.4) all nanoVNA versions and clones can run any nanoVNA firmware
(except Hugen's unique versions for HW version 3.4)
I suppose that the version splash screen shows when there is no valid configuration in SAVE 0.
Oristo