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Tip
  • The SB2040 comes pre-flashed with Katapult firmware for CAN connection at a rate of 1M
  • The Katapult firmware for SB2040 CAN connection supports rates of 500K and 1M, which can be re-flashed if needed
  • Katapult Firmware Flashing

Firmware Flashing Instructions

  • The SB2040 can be connected to the host via CAN connection
  • CAN requires the use of XT30(2+2)-F for connection
  • Below is the style of the XT30(2+2)-F data cable
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Note
  • Mainboard firmware flashing requires using Katapult to flash Klipper
  • If you confirm that the mainboard has already been flashed with Katapult, there is no need to proceed with the Katapult firmware flashing at the end

How to Determine Which Firmware You Need​

  • The SB2040 can only connect to the host via CAN
  • CAN Firmware Flashing
    • Advantages: If the Katapult firmware has been flashed, you can update the firmware without touching the mainboard, and it supports bus connections
    • Disadvantages: Using it with KlipperScreen may cause errors such as homing timeout
    • Tip: If you need to use CAN, make sure the host supports CAN, and you need to use a UTOC or a mainboard flashed with bridge firmware

Katapult Firmware Instructions​

Name Explanation

Katapult was formerly known as CanBoot, and both names may appear simultaneously in older tutorials or firmware names.

Katapult is a bootloader used to boot and update Klipper:

  • Katapult itself cannot be used as a Klipper MCU; after flashing, you still need to write Klipper firmware that matches the hardware and communication method.
  • Supported tool boards can enter Katapult by quickly double-pressing the RESET button; after entering, there is usually a status light blinking.
  • CAN, RS232, and USB use independent Katapult firmware; you cannot simply modify file names or mix them directly.
  • For CAN firmware, you must also select the correct bus speed, with common speeds being 500K and 1M.
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