usb-dat

Devices

MicroA_2_A_Female

Listed supported device in ST documents [https://www.st.com/content/ccc/resource/technical/document/application_note/6a/17/92/02/58/98/45/0c/CD00264379.pdf/files/CD00264379.pdf/jcr:content/translations/en.CD00264379.pdf AN3156]
Download [http://www.st.com/en/development-tools/stsw-stm32080.html DfuSe USB device firmware upgrade (DFU) software]
Install the drive in installation folder -C:\Program Files (x86)\STMicroelectronics\Software\DfuSe v3.0.5\Bin\Driver or here Tech-dat/Interface-dat/USB-dat/STM-Bootloader-Driver.zip STM32 Bootloader Driver
Testing firmware for File:Can-usb.zip USB-CAN here.
Open the DFU tool to upload firmware to internal flash, see left animation.

Short connect Boot0 + 3V3 to re-enter into USB DFU mode
use STM32CubeProgrammer upload hex or DFU file. In other boot try:
In case of SLCAN software connect UCCB and type in terminal '''boot''' device should reset and new device should connect to Your pc