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Hello All,

I cannot for some reason get my H4 into DFU mode on my laptop; I don't have a problem with my desktop computer (running the same version of NanoVNA App).
Is there something that I should be looking for to remedy this?
BTW, I know the answer is move it to the desktop for firmware updates, but I'm curios why it's not being found on my laptop.

TIA,
Muggs

What DFU software are you using? There are four programs for installing
firmware updates that I know about.

The original one from ST, Dfuse Demo, works well on older computers but
refuses to connect on many newer ones. The symptom is that it never sees
your device. (It's likely some sort of timing issue that makes it
incompatible with some USB controllers.) Sometimes it can be made to work
by switching to another USB port (try a USB 2.0 port if your system has
one), or by inserting a USB hub between the computer and your nanoVNA. ST
no longer supports that software so it won't get fixed.

Its replacement, STM32CubeProgrammer, works well on those newer computers
but is too big to run well on some older ones. An interesting gotcha is
that it requires .BIN files, while Dfuse uses the .DFU file format. Current
nanoVNA firmware can be downloaded in both formats; make sure to get the
one you need. (Older ones were only provided as .DFU files.) There is a
utility provided with Dfuse Demo that will convert between the formats; you
may want to install that even if you use STM32CubeProgrammer.

The final option is open source tools; dfu-tool and dfu-util are out there,
may be included with your Linux distribution if you run that OS, and
versions are also available for Windows and macOS. I have no personal
experience with them.

Hello Shirley. I am very confused. I feel I need to update my NANOVNA-H 4.

Current version is 1.1.01, build time Dec 20 2021.

The unit has a flickering blue line at the top of its screen. I am hoping an upgrade will help.

I want to use it for SWR for amateur radio antennas. Nothing more fancy that this task.

- I have downloaded and installed STM32CubeProgrammer.
- I have downloaded and extracted NanoVNA v.1.0.69 fw pack.zip.
- I pressed the "wheel button" and turned the unit on. The screen stayed dark. I plugged it into the USB cord. And, nothing.
- I opened Device Manager to see if one of my USB ports was USB2. Nope. All USB3.

What needs to be my next step?

I appreciate your help.

David

if You see STM32 BOOTLOADER,

- then You can use the app for fw upgrade.

- You do not need anything else, firmware included:




Istvaan

On Sun, Aug 13, 2023 at 11:57 AM, David McGuire wrote:

Hello Shirley. I am very confused. I feel I need to update my NANOVNA-H 4.

Current version is 1.1.01, build time Dec 20 2021.

The unit has a flickering blue line at the top of its screen. I am hoping an
upgrade will help.

Back to this original statement of the problem:
For SWR measurement, the 1.1.01 software build should work fine, so you may not need to upgrade. There are lots of new features in the newer versions, but nothing that should affect SWR traces.
What is the nature of the 'blue flickering line"? Could it be the blue trace line (at the top of the graphing area)? A trace line could appear to flicker if it is set for data that is not present.
If so, maybe all you need to do is disable the blue trace. On the menu go to Display -> Trace and click on any traces you are not using to disable them. For SWR, you probably want trace 1 enabled, and its format set to SWR.