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Katapult Firmware

Katapult Firmware Description​

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Katapult was originally named CanBoot and later renamed to Katapult.

  • Katapult firmware is a type of bootloader that can be used in conjunction with Klipper. After flashing via methods like DFU, the firmware can be updated with a single command.
  • Advantages: Quickly double-click the reset button or power off twice in quick succession to enter Katapult firmware, at which point an LED on the motherboard will blink.
  • Katapult firmware can only be used to flash firmware and cannot connect to Klipper!!!
  • Katapult firmware supports three methods for connecting to the host computer, with each method's firmware being independent of the others:
    • CAN connection
      • Advantages: After compiling the Klipper firmware, it can be updated directly using commands, with strong anti-interference capability.
      • Disadvantages: Requires prior knowledge of the firmware's compiled baud rate.
    • RS232 connection
      • Advantages: After compiling the Klipper firmware, it can be updated using commands, with very strong anti-interference capability.
      • Disadvantages: Cannot update the firmware with a single command; requires manually entering Katapult firmware.
    • USB connection
      • Advantages: After compiling the Klipper firmware, it can be updated directly using commands.
      • Disadvantages: Long data cables are prone to interference, which may cause disconnections.
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  • SHT36/42 supports CAN
  • Only CAN firmware is provided here, with rates of 500K and 1M

Enter Flash Mode​

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The circled one is BOOT

  • With the motherboard completely powered off, short the BOOT button, then connect one end of a TYPE-C cable with data transmission capability to the motherboard and the other end to your device.
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Flash Firmware​

  • Katapult firmware for SHT36
  • You can obtain the firmware via the following links:
  • The firmware location is at
FLY-Firmware/ToolBoard/SHT36
Important Notice

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

  • Some computer USB ports may have driver or signal compatibility issues, leading to unstable flashing. It is recommended that you try connecting to a different USB port.
  • If changing ports does not work, an effective solution is to connect via an external USB hub, which often improves compatibility.
  • When the flashing software reports the error message shown below, also try using a hub first. If the problem persists, please check or use the host computer software for flashing.
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  1. Flashing 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 flashing 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 the Browse button indicated by the arrow, then select the firmware you need to flash.
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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 flashing the firmware.
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  11. The prompt below indicates that the firmware flashing is complete.
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