With newer models, you hold the thumbwheel depressed while powering on. Generally I would say, if the nano is showing up on a com port when it is connected either it isn't actually in DFU mode.If it is an old model setting dfu mode is accomplished by shorting an internal connection while powering on. Mode” in the Available DFU Devices List, and the new firmware installs When I run the DFuse Demo v3.0.6 program I now see “STM Device in DFU The USB cable, an “STM Device in DFU Mode” appears in the list of USB This I found that when the nanoVNA is placed in DFU mode and connected via Installed the amd64.exe driver on the Windows 10 laptops. I then downloaded the STM Bootloader Driver package from That the bootloader driver did not install with the DFuse Demo v3.06 When I ran the DFuse v3.0.6 program Iĭid not see anything in the Available DFU Devices List. I wasĪble to install the v1.0.39 firmware for my H4 nanoVNA on the Windows 7 I have 3 laptops, two running Windows 10, and one running Window 7. On Fri, Jan 22, 2021, 4:55 PM Michael Brickell VE3TKI Removed theįront, cleared out the cover, boots fine. I used Zadig and installed drivers which cleared that, but still can't get the PC to recognize the nanoVNA in DFU Mode.įound my problem. It half installed it - under the 'Other' category in Device Manager but with a ? mark as it had no device drivers. Same problem except this time when I connected the unit in DFU mode to the PC, the PC tried but failed to install something called STM Bootloader. Gave up and tried the same process on my Win 10 laptop. And sure enough, when I start Dfuse Demo, it doesn't see my device so I can't flash the firmware. Then I put the unit into DFU mode (showed the white single line of test at the top of the screen), connected it to the PC, but when I look at USB Controllers under Device Manager I don't see 'STM Device in DFU Mode' as shown in the picture in Martin's guide. I can use all the PC based apps to connect to the device.

The virtual com port shows up fine under Ports in Device Manager and pops up when I connect the nanoVNA in regular mode.

I followed all the instructions, downloaded the Virtual COM Port installation from STM. I was using Martin Svaco's great beginner guide to learn how to upgrade the firmware. I am a newbie - just received a nanoVNA H.

Nanovna saa2