Hi

I am having problems (i can't calibrate) with OneOfEleven NanoVNA-App, I am using the nanoVNA V2 plus4 model maybe its not compatible with that model. here is what i have done so far:

re-installed USB driver
I tried 2 other computers, same problem ( Windows 8.1 and Windows 10)
I tried another USB cable

here are two videos so show what is going on:

part 1 video:
https://youtu.be/57Hw_0eYU-o ( https://youtu.be/57Hw_0eYU-o )

part 2 video:
https://youtu.be/k9cqhI7a4e4

any help would be great!  thanks