Hi Max,
We already know that the base unit does not have a -H (2.8 "screen) but a 4" screen NanoVNA-H4 with firmware 1.0.39.
Now all you have to do is find out from the person asking the message what computer program you are using on which the problem occurs.
To us, this is still more unknown. If you can find out, you may be able to get more helpful answers.
73, Gyula HA3HZ
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*** If you are not part of the solution, then you are the problem. ( ) ***
Gyula Molnar