Since I am on Windows Seven, I use nanovna-saver 0.3.8. My NanoVNA is

DEEPELEC NanoVNA-F 4.3" HW2.3 HW3.1 Firmware 1.05 (Oct 31, 2022)

I observe:

1/ To succeed, every time, the NanoVNA <-> PC connection, you must:

- Start the nanoVNA
- Connect the USB cable to the PC
- Start nanovna-saver
- clic [Connect] on nanovna-saver

If nanovna-saver is launched first, it does not work every time

2/ Then, before any measurements or calibration, it is essential to do in the nanoVNA menu
CALIBRATE
RESET
This operation is independent of the reloading of a previous calibration in nanovna-saver.

The need for RESET on the NanoVNA surprises me. Why doesn't nanovna-saver (my version) do it itself?
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F1AMM
François