У вашего броузера проблема в совместимости с HTML5
In this video, you will see how to program the STM32 with USB DFU if its available.
The Links that are mentioned in the video are:
AN2606 from ST:
http://www.st.com/content/ccc/resource/technical/document/application_note/b9/9b/16/3a/12/1e/40/0c/CD00167594.pdf/files/CD00167594.pdf/jcr:content/translations/en.CD00167594.pdf
ST Nucleo Board user manuel:
http://www.st.com/content/ccc/resource/technical/document/user_manual/98/2e/fa/4b/e0/82/43/b7/DM00105823.pdf/files/DM00105823.pdf/jcr:content/translations/en.DM00105823.pdf
Nucleo Pinout:
https://developer.mbed.org/platforms/ST-Nucleo-L476RG/
STSW-STM32080 - DfuSe USB device firmware upgrade STMicroelectronics extension: contains the demo GUI, debugging GUI, all sources files and the protocol layer (UM0412)
http://www.st.com/en/development-tools/stsw-stm32080.html
Geekcreit® 310Pcs 2.54mm Male Female Dupont Wire Jumper With Header Connector Housing Kit
https://www.banggood.com/Geekcreit-310Pcs-2_54mm-Male-Female-Dupont-Wire-Jumper-With-Header-Connector-Housing-Kit-p-1063303.html?p=9R09143243493201512Z
SN-48B AWG26-16 Non-Insulated Pin Crimper Tool 0.14-1.5mm2 for Dupont:
https://www.banggood.com/SN-48B-AWG26-16-Non-Insulated-Pin-Crimper-Tool-0_14-1_5mm2-for-Dupont-p-961535.html?p=9R09143243493201512Z
https://www.patreon.com/weblearning