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Tip
  • SB2040 PRO V3 comes pre-flashed from the factory with Katapult firmware for CAN connection at a rate of 1M
  • The Katapult firmware rate for SB2040 PRO V3 CAN connection is available in 500K and 1M; you can flash it yourself if needed
  • Katapult Firmware Flashing

Firmware Flashing Instructions

  • SB2040 PRO V3 can connect to the host computer via RS232 or CAN connection methods
  • RS232 and CAN require the use of XT30(2+2)-F for connection
  • Below is the appearance of the XT30(2+2)-F data cable
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Note
  • Flashing firmware to the mainboard requires using Katapult to flash Klipper
  • If you are sure the mainboard already has Katapult flashed, there is no need to perform the Katapult firmware flashing step at the end
  • You can quickly press the reset button twice and check if an LED on the mainboard starts blinking; if so, it indicates the mainboard has entered Katapult firmware

How to Determine Which Firmware You Need​

  • SB2040 PRO V3 can connect to the host computer using the following methods
  • CAN Firmware Flashing
    • Advantages: If Katapult firmware is flashed, firmware updates can be performed without touching the mainboard, and bus connection is supported
    • Disadvantages: Using it together with KlipperScreen may cause errors such as homing timeout.
    • Tip: To use CAN, ensure the host computer supports CAN, and it requires pairing with a UTOC or a mainboard flashed with bridge firmware
  • RS232 Firmware Flashing
    • Advantages: Can be used without special software, reliable and stable communication
    • Disadvantages: To reflash firmware, you need to enter manual DFU or double-click RST to enter Katapult for firmware updates
    • Tip: Requires pairing with G2T or UTOR for use

Katapult Firmware Description​

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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