Hi,
I have been busy a few hours to try to upgrade firmware of my NanoVNA H4 to 1.2.27.
Tried STMCube progammer 2.9.0, which usually is fine, with the correct 1.2.27 bin file, and get a black screen.
Tried to use STMCube progammer 2.15.0 which is said to work, black screen.
Tried NanoVNA app, after updating the driver to DFU, and 1.2.27 DFU file, black screen.
Fortunately, I was able to get my NanoVNA H4 back in business by using STMCube progammer 2.9.0 and 1.2.14 bin file.
The same day, I upgraded the firmware of my TinySA Ultra with STMCube progammer 2.9.0 without any issue.
This subject has been debated, but if someone has an idea...
Best regards and happy new year.
Georges F6DFZ
