If this duplicates a prior post I apologize but, if so, there are so many new users that it may bear repeating.
The same DfuSe Demo software that is used to upgrade the device firmware can be used to save the state of an existing device setup. If you have your Nanovna completely calibrated with Channel, Format, Marker, and Stimulus setups on each of Save0 - Save4 and you would like to preserve that setup for future use, you can use DfuSe Demo to upload the existing firmware along with all settings to a new, descriptive filename stored on the PC. If you then change firmware, calibration setups, etc and you want to restore the device you simply load the saved file in the same way you load firmware upgrade. All settings and calibrations are restored as well.
I have several files stored with different setups and calibrations and can download them at will to any of my three devices. It is a very handy capability for the lab bench.
Warren Allgyer
WA8TOD
Warren Allgyer