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Tip
  • The ERCF is pre-flashed with Katapult firmware via CAN connection at a rate of 1M.
  • The Katapult firmware for ERCF’s CAN connection is available in 500K and 1M speeds; you can flash it manually if needed.
  • Flash Katapult Firmware

Firmware Flashing Instructions

  • The ERCF can connect to a host computer using a CAN connection.
  • A XT30(2+2)-F connector is required for the CAN connection.
  • Below is the layout of the XT30(2+2)-F data cables:
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Important Notes
  • Flashing the motherboard firmware requires using Katapult to flash Klipper.
  • If it’s confirmed that the motherboard already has Katapult flashed, there’s no need to flash the Katapult firmware again.

How to Determine Which Firmware You Need​

  • The ERCF can connect to a host computer in the following ways:
  • Flash CAN Firmware
    • Advantages: If Katapult firmware is installed, the firmware can be updated without touching the motherboard, and bus connection is supported.
    • Disadvantages: Using it with KlipperScreen may cause errors such as timeout when returning to home.
    • Tip: If using CAN, ensure the host computer supports CAN and that a UTOC or a motherboard with bridging firmware is used.
  • Flash USB Firmware
    • Advantages: Like Katapult firmware, it allows firmware updates without touching the motherboard. Updates via memory card or DFU still require the traditional method, but the communication is reliable and stable.
    • Disadvantages: Multiple USB devices may interfere with data transmission.

Katapult Firmware Overview​

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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