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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​

Tip

Katapult was originally named CanBoot, and later renamed to Katapult

  • Katapult firmware is a type of bootloader that can be used in conjunction with Klipper. After flashing via DFU or similar methods, one-click firmware updates can be performed using commands.
  • Advantages: Quickly double-press the reset button or power cycle twice to enter Katapult firmware, during which 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 methods for connecting to the host machine, with each method’s firmware being independent of the others:
    • CAN connection
      • Advantages: After compiling the Klipper firmware, it can be updated directly using commands; strong anti-interference capability.
      • Disadvantages: The firmware compilation speed must be known in advance.
    • RS232 connection
      • Advantages: After compiling the Klipper firmware, it can be updated using commands; very strong anti-interference capability.
      • Disadvantages: One-click firmware updates via commands are not possible; 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, potentially causing disconnection.
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