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 mainboard completely powered off, long press BOOT and connect one end of a data transfer cable to the mainboard and the other end to your device, suitable for WINDOWS
• Second method: After connecting one end of a data transfer cable to the mainboard and the other end to your device, long press BOOT and enter the command, suitable for the host computer
  

Programming the firmware

Windows programming tutorial

• C8 bootloader firmware

  • Click the download link below
  • Loading...

• Set the dip switches 3, 4 to the right, connect the lower machine and the host computer via the built-in USB

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

  

Notice

• USB3.0 may fail to flash, please try to use the computer's USB2.0 for flashing
• If flashing still fails, please try using a host computer for flashing
• If the error below occurs, please use a USB hub
  

1. Flashing tool Download link
2. Please download SetupSTM32CubeProgrammer and STM32 DFU driver
3. Copy the previously compiled firmware klipper.bin, Katapult, or Marlin to any directory on your computer
4. Connect the motherboard to the computer using a Type-C cable, ensuring it has entered dfu flashing mode
5. In STM32CubeProgrammer, select USB mode, then refresh and connect
   
6. If no error pop-up appears, the connection is successful.
   Warning

   If the content shown in the figure below appears, it indicates a computer or software issue. Please use a host computer for flashing: Host Computer Flashing Tutorial

   
7. Click the download icon on the left and check the options below
   
8. Click the Browse button as indicated by the arrow, then select the firmware you need to flash
   
9. Enter 0x08000000 in the Start address field
   • Please note that if the firmware is in HEX format, skip this step!!
   
10. Click Start automatic mode below to begin flashing the firmware
    
11. If the prompt shown below appears, the firmware flashing is complete
    

Host computer programming tutorial

• Set the dip switches 1, 2 to the right, connect the lower machine and the host computer via the built-in USB

• Set the dip switches 3, 4 to the left, otherwise it will affect the connection between the lower machine and the host computer

  

• After setting the dip switches as described above, the USB port below will be occupied by the lower machine, please do not connect other devices

  

• Please ensure the host computer can access the internet

  sudo wget https://cnb.cool/3dmellow/public/static-files/-/git/raw/main/firmware/HIDBL.bin -O ~/HIDBL.bin && sudo fly-flash -d c8 -u -f ~/HIDBL.bin

• When the following prompt appears, long press the BOOT key on the lower machine and then press Enter

  

• When the following image appears, it indicates that the programming is successful and you can release the BOOT key