NanoVNA-App contains a facility to upload / download NanoVNA flash memory using the DFU bootloader. The appropriate Windows driver filename is STTub30.sys (or later?) from ST. Above is a properties list from USBDView of the correct driver. If you wish to use it, make sure that you have not replaced the bootloader driver with something … Continue reading NanoVNA-App – driver for NanoVNA firmware updates