I had the same or similar problem last week when upgrading my H4.? It was a driver problem. Windows kept loading the STM32 Bootloader driver and I needed the "STM device in DFU mode" driver ......I found this post by Don KB5QR and it got me on the right road:
/"I ran into the same problem with Windows 10 not seeing my NanoVNA in DFU mode. I found the fix via a Google search that led me to forum on www.deviationtx.com. One of the members by the handle of "Nuggetz" suggested that the driver in use was not the DFU version. This is what he did, and it worked for me:
Connect the NanoVNA and put it in DFU mode. Go into device manager and find the STM device under "Universal Serial Bus devices" (at the very bottom of the window). Expand this item and you will probably see "Hub Controller" and "STM32 BOOTLOADER". Right Click on "STM32 BOOTLOADER" and select update driver then choose "Browse my computer for drivers". After that, select "Let me pick from a list of available drivers on my computer".
The driver choices you see there should include "STM device in DFU mode". Select the DFU mode one and that'll do it.
If you don't see both "STM32 BOOTLOADER" and "STM device in DFU mode", /_*then you probably need to install the driver using the dpinst_amd64.exe utility, found in the Win10 folder under Program Files(x86)/STMicroelectronics/Software/DfuSe v3.0.6/Bin/Driver.*_/
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Hope this Helps.
73,
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/Don, KB5QR"/
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I was able to complete the upgrade without any further issues. ?? Thanks Don!!!
73, Dave - W3NP
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On 9/7/2021 11:16 AM, Andy-kf7vol wrote:
Good Morning,
I didn't make any driver change after having a success story updating my H model. When I plug in the H4 and hold the button down and power on to DFU mode it still is not recognized.
