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| | 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 required wires.  
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Building a SWD cable| Column |
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| SWD port pinout | # | Function |
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| 1 | GND | | 2 | NONE | | 3 | IO | | 4 | CLK |
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Connect the GND, IO and CLK wires between the SWD port and the STLink dongle, the pin2 is not used.
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| Please note the IO and CLK lines are inverted reversed for Sparky2 board ! pin3 is CLK and pin4 is IO |
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Software setup
Download the required software from the ST website, need registration: ST website download page
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Update STLink dongle firmware
If you have problems you may try updating the dongle firmware, but be aware that this can brick a clone STLink dongle.
Connect the STLink dongle and start the ST-Link Utility software.
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- Disconnect the STLink dongle.
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Bootloader binaries
Here is the bootloader binaries for various boards, to be used with STLink utility:
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For bu_* files to be flashed using GCS, see the Downloads page instead.
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| Flash Bootloader with STLink Utility
Connect and apply power - Connect the STLink dongle to a USB port.
- Connect the JST connector to the board's SWD port.
- Power the board: can be using external +5V on Output connector, or using the USB port
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- Connect the device using the
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- At this point memory content should be populated and device characteristics displayed, here is a CC3D example:
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- Click Start to flash device
- Device is now flashed with the new bootloader file.
- 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.
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