Skip to main content
tip
  • The SB2040 V3 is pre-flashed with the Katapult firmware for CAN connection at a rate of 1M
  • The SB2040 V3 Katapult firmware for CAN connection has rates of 500K and 1M, which can be flashed by yourself if needed
  • Katapult Firmware Flashing

Firmware Flashing Instructions

  • The SB2040 V3 can connect to the host computer using either RS232 or CAN
  • RS232 and CAN require the use of XT30(2+2)-F for connection
  • Below is the XT30(2+2)-F data cable style
Note
  • Flashing the motherboard firmware requires flashing Klipper through Katapult
  • If you are sure that the motherboard has already been flashed with Katapult, there is no need to flash the Katapult firmware at the end, which is just a precaution in case the Katapult firmware on the motherboard did not flash successfully
  • You can quickly press the reset button twice and check if an LED on the motherboard starts blinking, which indicates that the motherboard has entered the Katapult firmware

How to Determine Which Firmware You Need​

  • The SB2040 V3 can connect to the host computer in the following ways
  • CAN Firmware Flashing
    • Benefits: If the Katapult firmware is flashed, firmware updates can be done without touching the motherboard, and bus connection is supported
    • Drawbacks: Might cause homing timeout errors when used with KlipperScreen.
    • Tip: Make sure your host computer supports CAN and needs to be paired with UTOC or a motherboard flashed with bridge firmware
  • RS232 Firmware Flashing
    • Benefits: No special software required, reliable and stable communication
    • Drawbacks: Firmware updates require manual DFU mode or double-clicking RST to enter Katapult to update the firmware
    • Tip: Needs to be paired with G2T or UTOR to use

Katapult Firmware Explanation​

tip

Katapult was originally named CanBoot and was later renamed.

  • Katapult firmware is a type of bootloader that can be used in conjunction with Klipper. After being flashed using methods like DFU, you can use commands to update the firmware in one click.
  • Advantages: Double resetting or quickly cutting power twice will enter the Katapult firmware, and the pre-configured LED will flash; if not configured, it won't flash.
  • The Katapult firmware can only be used for flashing firmware and cannot connect to Klipper!!!
  • There are three ways to connect the Katapult firmware to the host machine:
    • CAN connection
      • Advantages: After compiling the KLIPPER firmware, you can directly update the firmware using commands.
      • Disadvantages: You need to know the firmware compilation rate in advance.
    • RS232 connection
      • Advantages: After compiling the KLIPPER firmware, you can update the firmware using commands.
      • Disadvantages: You cannot update the firmware in one click using commands; you need to manually enter the Katapult firmware.
    • USB connection
      • Advantages: After compiling the KLIPPER firmware, you can directly update the firmware using commands.