John,
I can confirm what Christian wrote. I updated the fw on my -H4 a few days ago.
To enter DFU mode, hold down the jog wheel before switching on; switch on; release jog wheel; the screen remains dark (worryingly dark, if you're expecting something on the screen!) and the nanoVNA-H4 is now in DFU mode.
At this point you can connect it to whatever PC you use, and update the firmware. If you're using Ubuntu Linux, I can offer further assistance, otherwise it's back to the Wiki!
HTH, 73, Stay Safe,
Robin, G8DQX
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On 16/11/2020 07:35, Christian Zietz wrote:
Hello John,
some remarks:
- You have the NanoVNA H4 model with 4" screen (which you probably know), so be sure to use a firmware built for the H4 while upgrading.
- The H4 can be put into DFU mode by holding the "jog dial" down during power-up. But bridging the two contacts that you marked in your photo should work, too.
- Apparently, for the H4 it's normal that the screen stays black, not white as in the models with 3" screen.
Here's a detailed video of someone going through the firmware update process on a NanoVNA H4 with firmware 0.5.0, just like yours:
Hope that helps.
Regards
Christian
