AcSiP S7xG flashing instructions - alex-43/SoftRF GitHub Wiki
First-time firmware installation procedure
S76G
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Take STM32 USB firmware upgrade tool (DfuSeDemo) from this location: https://www.st.com/en/development-tools/stsw-stm32080.html#overview
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Download appropriate DFU variant of the SoftRF firmware from this location
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Press and hold BOOT button on your S76G device, plug the board into your computer's USB slot, then release BOOT button
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STM Device in DFU Mode should appear in the list of hardware:

- Run DfuSeDemo application, STM Device in DFU Mode should become selected automatically:

- Press Choose menu button, then select firmware file as follows:

- The file is loaded into the program's memory:

- Press Upgrade button:

- Then wait for completion:

- Press Leave DFU mode button:

- If the flashing procedure was successful, the S76G board should appear in the list of hardware as COM port:

- Connect to the COM port while using PuTTY utility as follows:

- A flow of NMEA sentences should come up:

- If you see the NMEA sentences - your firmware installation is done.