BL firmware

tip

• Please note that the bootloader has already been pre-flashed, no need to flash again

Enter programming mode

• There are two ways to enter programming mode
• First method: With the main board completely powered off, short-circuit BOOT and BOOT1, then connect one end of a data transfer cable to the main board and the other end to your device
• Second method: After connecting one end of a data transfer cable to the main board and the other end to your device, short-circuit BOOT and BOOT1, then press the RST key, release the RST key, and finally disconnect the BOOT jumper
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Flashing firmware

Windows flashing tutorial

• Gemini bootloader firmware

  • Click the download link below
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• Set dip switches 3, 4 to the right, connect the lower machine and upper machine via built-in USB

• Set dip switches 1, 2 to the left, otherwise it will affect the connection between the lower machine and upper machine

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Important Notice

To ensure successful STM32 programming, please pay attention to the following:

• Some computer USB ports may experience unstable programming due to driver or signal compatibility issues. It is recommended to try connecting to a different USB port.
• If changing ports does not help, an effective solution is to connect via an external USB hub, which often improves compatibility.
• When the programming software reports the error message shown below, also try using a hub first. If the issue persists, please check or use the host computer for programming.
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1. Programming Tool Download Link
2. Download SetupSTM32CubeProgrammer and the STM32 DFU Driver.
3. Download the firmware to any directory on your computer.
4. Connect the mainboard to the computer using a Type-C cable. Ensure it has entered DFU programming mode.
5. In STM32CubeProgrammer, select USB mode, refresh, and connect.
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6. If no error pop-up appears, the connection is successful.
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7. Click the download icon on the left and select the options shown below.
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8. Click Browse as indicated by the arrow, then select the firmware you need to program.
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9. For Start address, enter 0x08000000.
   • Note: If the firmware is in HEX format, please skip this step!!
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10. Click Start automatic mode below to begin programming the firmware.
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11. The prompt below indicates that the firmware programming is complete.
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Upper machine flashing tutorial

• Set dip switches 1, 2 to the right, connect the lower machine and upper machine via built-in USB
• Set dip switches 3, 4 to the left, otherwise it will affect the connection between the lower machine and upper machine
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• After setting the dip switches as described, the USB port below will be occupied by the lower machine, please do not connect other devices
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1. Install the flashing tool

• This step is not required for FLY host software.
• If installation is needed, ensure the host computer is connected to the internet.
• If the flashing tool has already been installed, you may skip this step.

sudo apt update
sudo apt install dfu-util -y

2. Check device connection status

• Run the following command to confirm whether the device is successfully connected:

lsusb

• If the DFU device is not recognized, try re-entering flashing mode.
• In some system versions, the device name might differ; as long as 0483:df11 appears, it indicates the device has successfully entered flashing mode.

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3. Obtain the pre-compiled firmware

• Below are pre-compiled firmware files. Please choose the corresponding command based on your system type to download (ensure the host computer can access the internet). If download fails due to network issues, please contact the after-sales group administrator for assistance.

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FlyOS-Armbian or Standard System

cd && git clone https://github.com/FengHua741/FLY_Katapult.git

FlyOS-FAST System

git clone https://github.com/FengHua741/FLY_Katapult.git /data/FLY_Katapult 
ln -s /data/FLY_Katapult /root/FLY_Katapult

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• If you have previously downloaded the firmware package, it is recommended to update to the latest version before proceeding:

cd ~/FLY_Katapult && git pull

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4. Flashing firmware

tip

Only one of the firmware needs to be flashed

• The following is the bootloader firmware writing command

  sudo dfu-util -a 0 -d 0483:df11 --dfuse-address 0x08000000 -D ~/FLY_Katapult/BL/Gemini/GeminiV3.bin

5. If the content shown in the arrow in the following figure appears File downloaded successfully, the flashing is successful

warning

Ignore the error after the line indicated by the red arrow!

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tip

After flashing, the main board needs to be completely powered off once.