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Tip
  • The SB2040 V3 comes with Katapult firmware for CAN connection pre-flashed at the factory, with a baud rate of 1M.
  • The SB2040 V3 Katapult firmware for CAN connection is available in both 500K and 1M baud rates; you can flash it yourself if needed.
  • Katapult firmware flashing

Firmware Flashing Instructions

  • The SB2040 V3 can connect to the host via two methods: RS232 or CAN.

  • RS232 and CAN require 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 using Katapult to flash Klipper.
  • If you are sure the mainboard has already been flashed with Katapult, 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 it does, the mainboard has entered Katapult firmware.

Selecting the Firmware Type​

Please confirm the connection method first.
  • If a CAN toolboard is required: choose CAN firmware.
  • If an RS232 connection is required: choose RS232 Firmware.
  • Only one of the two firmware types can be selected. Do not flash both simultaneously.
Firmware TypeApplicable ScenarioAdvantagesConfirm before selectingOperation
CAN FirmwareWhen a CAN toolboard is requiredSupports connecting multiple devices via CAN busConfirm the host supports CAN and prepare a UTOC or USB-CAN bridge mainboardCompile CAN Firmware
RS232 FirmwareWhen an RS232 connection is requiredStable communication, simple configurationRequires RS232 connection devices such as G2T or UTORCompile RS232 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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