Tip

• The ERCF comes pre-flashed from the factory with Katapult firmware for CAN connections at a rate of 1M
• The ERCF CAN connection Katapult firmware rates are available in 500K and 1M, and can be re-flashed as needed
• Katapult firmware flashing

Firmware Flashing Instructions

• The ERCF can be connected to the host using a 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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Instructions

• The mainboard firmware needs to be flashed with Klipper via Katapult
• If you are sure the mainboard has already been flashed with Katapult, flashing the Katapult firmware at the end is unnecessary

Selecting the Firmware Type

Please confirm the connection method first

• When a CAN toolboard is required: choose CAN firmware.
• When a CAN toolboard is not used: choose USB firmware.
• Only one of the two firmware types can be selected; do not flash both.

Firmware Type	Applicable Scenario	Advantages	Confirm before Selection	Operation
CAN Firmware	When a CAN toolboard is required	Supports connecting multiple devices via CAN bus	Confirm the host supports CAN, and prepare a UTOC or USB-CAN bridge mainboard	Compile CAN Firmware
USB Firmware	When a CAN toolboard is not used	Stable communication, simple configuration	When not using a CAN toolboard, use the USB firmware	Compile USB Firmware

Katapult Firmware Instructions

Name Description

Katapult was formerly named CanBoot; both may appear simultaneously in old tutorials or old firmware names.

Katapult is the bootloader used to boot and update Klipper:

• Katapult itself cannot be used as a Klipper MCU; after flashing, the Klipper firmware matching the hardware and communication method still needs to be written.
• The method for entering Katapult is subject to the current product page: boards with a RESET button can enter by quickly double-pressing RESET; boards with only a BOOT button require fully powering off first, then holding BOOT while connecting USB, and releasing it once the device is recognized. After entering, there is usually a status LED blinking.
• CAN, RS232, and USB use mutually independent Katapult firmware and cannot be mixed by simply changing the file name or using them directly.
• CAN firmware must also select the correct bus rate; common rates are 500K and 1M.