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

Firmware Flashing Instructions

  • SB2040 V3 can be connected to the host computer using RS232 or CAN connection methods
  • RS232 and CAN require an XT30(2+2)-F connector
  • Below is the style of the XT30(2+2)-F data cable
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Note
  • Flashing the motherboard firmware requires using Katapult to flash Klipper
  • If you are certain that the motherboard has already been flashed with Katapult, there is no need to perform the final step of flashing the Katapult firmware
  • You can quickly press the reset button twice and observe if an LED on the motherboard starts blinking; if so, it indicates that the motherboard has entered Katapult firmware mode

How to Determine Which Firmware You Need​

  • SB2040 V3 can be connected to the host computer using the following methods
  • CAN Firmware Flashing
    • Advantages: If the Katapult firmware is flashed, firmware updates can be performed without touching the motherboard, and it supports bus connections
    • Disadvantages: When used together with KlipperScreen, it may cause errors such as homing timeout
    • Note: If using CAN, ensure the host computer supports CAN and requires a UTOC or a motherboard with bridge firmware flashed
  • RS232 Firmware Flashing
    • Advantages: No special software required; reliable and stable communication
    • Disadvantages: To re-flash the firmware, you need to enter manual DFU mode or double-click RST to enter Katapult for firmware updates
    • Note: Requires a G2T or UTOR to 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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