This page describes how to recover a board using ST-Link dongle, this procedure can be applied to all boards like CC3D, Revolution, RevoNano or Sparky2 boards.
Most boards have the SWD port already populated, if not you may need to solder directly the needed required wires.
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The STLink dongle firmware us is up to date now.
Disconnect the STLink dongle.
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Disconnect the device using the Disconnect button:
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Update the firmware
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After the bootloader is restored, you can flash the firmware using GCS and "manual" method:
Disconnect board from USB port
Hit Upgrade&Erase button
Connect board to USB port
Wait the flash process, reboot and erase flash, this can take up to 30s.