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Tip
  • SB2040 PRO comes pre-flashed with Katapult firmware for CAN connection at a rate of 1M
  • The Katapult firmware for SB2040 PRO CAN connection supports rates of 500K and 1M; you can flash it as needed
  • Katapult Firmware Flashing

Firmware Flashing Instructions

  • The SB2040 PRO can connect to the host computer 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
  • To flash the motherboard firmware, you need to flash Klipper via Katapult
  • If you are sure the motherboard has already been flashed with Katapult, there is no need to perform the Katapult firmware flashing at the end

How to Determine Which Firmware You Need​

  • The SB2040 PRO can connect to the host computer using the following methods
  • CAN Firmware
    • Advantage: If the Katapult firmware is flashed, firmware updates can be performed without touching the motherboard, and bus connection is supported
    • Disadvantage: When used with KlipperScreen, it may cause errors such as homing timeout
    • Tip: If you need to use CAN, ensure that the host computer supports CAN and needs to be paired with a UTOC or a motherboard flashed with bridge firmware

Katapult Firmware Description​

  • The SB2040 PRO comes with Katapult firmware for CAN connection at a rate of 1M by default
Tip

Katapult was originally named CanBoot and later renamed to katapult.

  • The Katapult firmware is a type of bootloader that can be used together with Klipper. After flashing via DFU or other methods, firmware can be updated with a single command.
  • Advantages: Quickly double-click the reset button or power cycle twice to enter the Katapult firmware, at which point the LED on the motherboard will blink.
  • Katapult firmware can only be used to flash firmware and cannot connect to Klipper!!!
  • Katapult firmware supports three ways to connect to the host computer, and the firmware for each method is independent.
    • CAN connection
      • Advantages: After compiling the Klipper firmware, it can be updated directly using commands, with strong anti-interference capability.
      • Disadvantages: The firmware compilation speed needs to be known in advance.
    • RS232 connection
      • Advantages: After compiling the Klipper firmware, it can be updated using commands, with very strong anti-interference capability.
      • Disadvantages: Firmware cannot be updated with a single command; manual entry into Katapult firmware is required.
    • USB connection
      • Advantages: After compiling the Klipper firmware, it can be updated directly using commands.
      • Disadvantages: Long data cables are prone to interference, which may cause disconnection.
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