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I got NanoVNA with some old firmware. It worked ok up to 900 MHz. as it was missing number of features I decided to do upgrade.

I upgraded to reald NanoVNA-0.3.1-20191021-FONT.

After that I cannot do proper calbration for frequencies above 310 MHz.

Calibration for whole range 50kHy to 900MHz does not work, smith chart shows random lines all over the screen.

Calbration for range 1 MHz o 30 MHz works fine.

Also, calibration for range 100MHz to 310 MHz works ok.

But if I try any range that uses frequencies above 310 MHz shows erraticall readings.