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
Flashing firmware
- Windows flashing tutorial
- Upper machine 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
Notes
USB3.0
may fail to burn, please try to use theUSB2.0
of the computer for burning- If it still cannot be burned, please use the host software for burning
- If the error below appears, please use a USB extension dock
- Burning tool Download address
- Need to download
SetupSTM32CubeProgrammer
andSTM32 DFU driver
- Copy the compiled firmware
klipper.bin
,Katapult
orMarlin
to any directory on the computer - Use a Type-C data cable to connect the mainboard to the computer, and make sure it is in
dfu
burn mode - In STM32CubeProgrammer, select USB mode, refresh and connect
- If no error pop-up appears, the connection is successful.
Warning
If the content shown in the figure appears, it is a computer or software issue. Please use the host software for burning:Host software burning tutorial
- Click the left download icon and select the ones below
- Click the
Browse
indicated by the arrow, and then select the firmware you need to burn - Select
Start address
and input0x08000000
- Please note that if the firmware is in
HEX
format, skip this step!
- Please note that if the firmware is in
- Click
Start automatic mode
at the bottom to start burning the firmware - If the prompt below appears, it means the firmware has been burned successfully
- 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 - After setting the dip switches as described, the USB port below will be occupied by the lower machine, please do not connect other devices
- Install the burning tool
- No need to install the burning tool for the FLY upper computer
- If you need to install, please note: The upper computer needs to be connected to the internet to install normally
- If already installed, no need to install
sudo apt update
sudo apt install dfu-util -y
- Execute the following command to check if the connection is successful.
lsusb
- If there is no DFU device, please try to re-enter burning mode
- Due to system version issues, other names may be displayed. If
0483:df11
is shown, it indicates that the burning mode has been entered

- Pull the pre-compiled firmware
- These are all pre-compiled firmwares
- Please note: The upper computer needs to be connected to the internet to install
- The upper computer needs to execute the command below to download the firmware package (if unable to get the file due to network issues on the upper computer, please contact the administrator in the after-sales group)
cd && git clone https://github.com/FengHua741/FLY_Katapult.git
- If the firmware package has already been downloaded, it is recommended to update the firmware package before proceeding with the remaining operations
cd ~/FLY_Katapult && git pull
- 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
- 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!

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