Tip

• The SB2040 comes pre-flashed with Katapult firmware for CAN connection at a rate of 1M
• Katapult firmware for SB2040 CAN connection is available in both 500K and 1M rates, and 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 a XT30(2+2)-F for connection

• Below is the XT30(2+2)-F data cable style

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Notes

• Mainboard firmware flashing requires flashing Klipper via Katapult
• If you are certain the mainboard already has Katapult flashed, there is no need to flash the Katapult firmware at the end

Choose Firmware Type

Please confirm the connection method first

• The SB2040 can only connect to the host via CAN.
• When a CAN toolboard is needed: please select CAN firmware.

Firmware Type	Applicable Scenario	Advantages	Confirm Before Selecting	Operation
CAN Firmware	When a CAN toolboard is needed	Supports connecting multiple devices via CAN bus	Confirm the host supports CAN, and prepare a UTOC or USB-CAN bridge board	Compile CAN Firmware

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.