On Wed, Feb 26, 2025 at 10:52 AM, Len Ward wrote:
Mine is not seen by Win 10 device manager. ( tried 2 cables and machines) I
heard there is a way to get it out of DFU mode internally?
Mine did not die updating firmware, but it was hooked up to PC using "saver"
program I think.
I installed the dfu se demo and file manager, but it's useless since PC can't
see the device
NanoVNA Saver does not touch your firmware so it could not have damaged your device. Your device cannot be "bricked" because the DFU loader is built into ROM on the microprocessor.
Does your device boot at all or is it just a black or white screen? Can you talk to it using the USB COM port and a serial program like Putty?
To get the H4 device into DFU mode you can do one of the following:
- Select DFU from the menu
- Push the jog switch down with the power off and then power on
- Open the case and short the VDD and Boot0 pins, then power on and remove the short
When you do one of the above and are connected to a Windows PC you should hear a "bing" in Windows. If you go into Device Manager you should see that your device is recognized. One of two drivers will be installed. One works with DFUse and nanoVNA app for firmware loading and the other works with STM Cube. You can search this group and the group Wiki for the many messages on how to install drivers and use these programs.
Also suggest you read the Absolute Beginners Guide to the NanoVNA in the Files section of this group.
Roger
Roger
Roger Need