Tip

The SHT36 PRO comes pre-flashed with Katapult firmware for CAN connection at a rate of 1M.
The SHT36 PRO CAN-connected Katapult firmware is available in 500K and 1M rates, and you can flash it yourself if needed.
Katapult firmware flashing

Firmware Flashing Instructions

Notes

The mainboard firmware needs to be flashed with Klipper via Katapult.
If you confirm that Katapult is already flashed on the mainboard, there is no need to flash the Katapult firmware again at the end.

Selecting the Firmware Type

Please confirm the connection method first.

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

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.