how to flash/ update STM32 S76G firmware

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I would like to ask for some help or advice to fix the below:

I want to flash/ update the firmware (.dfu file) of my LILYGO TTGO 
T-Motion/softRF Dongle which runs on STM32 S76G Lora Chip by using DfuSe 
Demo

Unfortunately the device is recognized as “STM32 BOOTLOADER” in Windows 
device manager instead as “STM Device in DFU Mode”

What can I do to get this dongle identified correctly? So it becomes 
visible in DfuSe Demo?

Thanks a lot!
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