I think I'm in a similar situation to OP. When I connect my TinySA Ultra in DFU mode to my Windows 10 x64 desktop, I see "STM32 BOOTLOADER" under "Other devices" in the device manager but there's no driver assigned. I downloaded STTub30.sys from but when I try to update the STM32 BOOTLOADER driver by pointing to my download folder, it isn't recognized. As a result, when I execute "dfu-util -a 0 -s 0x08000000:leave -D tinySA.bin" per the instructions at I get a string of errors reading "Invalid DFU suffix signature / Cannot open the device at 0483:df11 / No capable DFU device available".
I can certainly live with my TinySA Ultra as-is, but it would be nice if updating the firmware were more straight-forward (I've done so far more easily with my other devices, like my NanoVNA). Any pointers on what I'm missing are genuinely appreciated.
