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Only connect SWDIO, SWCLK and GND. NRST is not needed. Neither is VDD

If needed force nanoVNA in DFU mode by connecting BOOT0 and VDD before switching on.



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NanoVNA Wiki: /g/nanovna-users/wiki/home
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Erik, PD0EK

Eric, if DeFuSe demomshows your device is in dfu mode, your driver's are working. Make sure you're using the Upgrade (Flash) button and not the Upload (read device flash) function.?
If you used Upload, grab a new copy of the H FW you wanted to flash as you corrupted whatever file you were using.?
As Erik said, you only need Dio, clk, gnd and maybe vdd and all the pins are already marked along the side of the Nanovna. For STlink, you do not need to put it info dfu mode.?


On Tue, 29 Sep 2020 at 10:26 AM, Eric Ball<erictball@...> wrote: I inadvertantly selected the H4 firmware when attempting to upgrade my 2.5" screen H NanoVNA resulting in a permanent white screen. To compound the matter, whilst trying to recover I appear to corrupted the Serial/USB driver (Windows 10) so that, even though DfuSe shows 'STM Device in DFU Mode" and that when I attempt to write to the NanoVNA all appears to load and verify my NanoVNA remains white screen.
I've purchased a ST Link-V2 but the supplied ribbon has only four connectors and the NanoVNA has SWDIO, SWCLK, GND, NRST and VCC (?) so I'm unsure how to connect it.
As can be seen from the above - I need expert assistance!