1) I installed the NanoVNA-H__800_ch_20191003 version and now it no longer crashes (after the screen calibration, with or without saving).
With 4 tracks the fonts are now very small ... this is a problem for me.
2) In session "Upgrade or Verify Action", the program does not allow me to load the file DMR-CLEAR_MEMORY_DFU.dfu ... Response: "This file doesn't have a correct format..."
Why?
