Hi Ian,
Since NanoVNA-Saver v0.5.4 was released on January 1, 2023 and NanoVNA firmware 1.0.69 was released on June 24, 2021, you may have operational problems.
The release of the firmware is followed by the developers of the PC programs.
Therefore, it is recommended that you use at least the same version of firmware for the PC program on the device.
Currently, the NanoVNA (-H) firmware is version 1.2.17 or higher.
Depending on which one is released by the developer, one is available.
The information I publish does not predate the actual release.
So if the developer doesn't publish it somewhere, I won't get ahead of it because I'm aware of it.
You can find more information about the releases so far on my website.
--
Gyula HA3HZ ( )
HA3HZ