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"There are 3 possible drivers that may appear in Device Manager:

Another possible driver "ChiBios/RT Virtual COM Port"

Why? Someone with this problem needs to test why and post repeatable results here.

Presumably because, sometime in the past, another device (e.g. ST-Link)
or application provoked installation of those drivers
along with a .inf file that associates nanoVNA USB device ID with those drivers.

"Connect your device in bootloader mode." I think you mean "... DFU mode."

Oops, my bad for copying from another suggestion without proofreading.

From STM's driver page:
"Starting from Windows? 10, the STSW-STM32102 driver is no more adequate
and the usage of the native inbox driver is recommended."


I have taken another whack:
/g/nanovna-users/wiki/drivers