Tip

The SB2040 PRO comes pre-flashed with Katapult firmware for CAN connections at a rate of 1M.
Katapult firmware for SB2040 PRO CAN connections is available in 500K and 1M rates, and can be re-flashed as needed.
Katapult firmware flashing

Firmware Flashing Instructions

Important Notes

Mainboard firmware must be flashed with Klipper via Katapult.
If you are certain that the mainboard already has Katapult flashed, there is no need to flash the Katapult firmware at the end.

Selecting the Firmware Type

Please confirm your connection method first.

Firmware Type	Applicable Scenario	Advantages	Before Selecting	Operation
CAN Firmware	When a CAN toolboard is needed	Supports multiple devices on a CAN bus	Confirm the host supports CAN, and prepare a UTOC or USB-CAN bridge board	Compile CAN Firmware

The SB2040 PRO comes pre-installed with Katapult firmware for CAN connections at a rate of 1M by default.

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.