NanoVNA H4 Stuck in DFU Mode

Hey everyone
A viewer commented on the NanoVNA H4 firmware upgrade video stating that it was stuck in DFU mode and he was unable to get it out of there.
This issue can happen from time-to-time. There is a few options to fix this problem so I asked the viewer to send me their NanoVNA H4 so I may attempt to fix it and provide some guidance for others that may have this issue.
In this video I show you how to use the first, and easiest method to fix a NanoVNA H4 that is stuck in DFU mode.
If you have a similar issue and this method does not solve your issue please reach out to me as i would be interested in demonstrating the other methods to fix the problem.
Thank you for watching and I hope this helps others with the same issue.
73, Matt N3VAN

[@richardharris5819]

Thanks for the info.. You always have had great knowledge transfer.

[@janiceemery2008]

Love it as always Matt, thank you for sharing.

[@n3vanradio]

Thank you very much. Hoping this helps someone with the same issue!

[@clems6989]

Thanks for the videos Matt N3VAN, from Matt N8QZH...."73"

[@KS0JD]

Great video! It would have been interesting to see how you do the in reset as well. 73

[@n3vanradio]

Thank you! Maybe someone will have a NanoVNA that is more stuck than this one that I can show the other methods :) 73!

[@manuelcv9475]

Perfect explanation

[@n3vanradio]

Thank you very much!

[@CanyoneerDuke]

Thanks Brother. And thanks for the NanoVNA info

[@n3vanradio]

You are very welcome. Your NanoVNA was safely packaged and on its way back to you :)

[@SalCornacchia]

Hi Matt, Can You advise me on the other methods this one did not work the U DISK drive don't show up on the desktop Thank You

[@test-uc2sc]

After attempting to follow the updating procedure in the previous video, my Screen is blank, and I get an error message saying "The last USB device you connected to this computer malfunctioned and Windows does not Recognize it" . The device does not show up in the Device Manager/USB Controllers listing now. Is there a "factory reset" button? Thanks.

[@n3vanradio]

Sometimes this method works other times you have to do the hardware method. 1. Open NanoVNA-H 2. Short VDD with BOOT0 3. Turn on NanoVNA-H --->>> White display = DFU mode 4. Write Firmware. Hope this helps! 73 Matt N3VAN

[@user-mm9xw9jk9n]

Hello Can you do a video open it up and show how to do shorting pins Thank You

[@XRPforever]

Hello I don’t have the menu. Not with button and with pen.

[@Michael.G-1871]

☝👍💯❤

[@user-mm9xw9jk9n]

Hi Matt, Can You advise me on the other methods this one did not work the U DISK drive don't show up on the desktop Thank You