Hi Ian,
You should not open a new topic because your problem cannot be followed.
If I take it well from your various writings, you will try under Win 10.
Put the device in dfu mode by first pressing and holding the multi-function button on the NanoVNA before plugging in the USB connector until the connection is made.
Then check the device manager or DfuSe Demo to see if the program sees the device. When in dfu mode, it is not visible between COM ports. When in VNA mode, the COM port is displayed. It follows that the device cannot be accessed in terminal program in dfu mode.
Continue the firmware upload in dfu mode: use the buttons in the lower right corner of the DfuSE Demo program (Upgrade or Verify Action). Select the firmware to be uploaded (Choose ...). Once selected, the Ugrade button will also darken and press 'Upgrade'. When done, disconnect the USB connector and restart the device. You will then need to log in with the new firmware. Now you need to access the device via USB with a terminal program.
Ask for available commands by typing help.
If you have problems using the terminal program, read the help on the program's website beforehand.
After answering the help question, type: clearconfig 1234
You will get an answer to this. Then, if necessary, perform a touchscreen calibration. You may not need to see it when using the touch screen.
Then calibrate to the frequency range you want to use and save it to a memory. After completing the calibrations, be sure to use the 'saveconfig' command. You should see the backups when you turn on the device again.
Maybe I didn't forget anything.
Don¡¯t post a new topic until you have the same problem. Continue here.
73, Gyula HA3HZ
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*** If you are not part of the solution, then you are the problem. ( ) ***
Gyula Molnar