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FLY-TOOL-LITE CAN Bootloader (Katapult) Recovery

For unbricking recovery only

FLY-TOOL-LITE CAN comes with Katapult pre-flashed from the factory. Do not re-flash the firmware on this page during normal use or when updating Klipper firmware; this page is only for unbricking recovery after the Bootloader is corrupted.

Firmware Description​

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.
  • FLY-TOOL-LITE CAN uses CAN communication.
  • This page only provides Katapult firmware for 1M CAN speed.
CAN speed must match

This firmware can only be used on a 1M CAN network. The host, mainboard, and all CAN devices on the same bus must use the same speed.

Entering Flash Mode​

Power off before proceeding

Before starting, completely turn off the printer and disconnect the power supply. Do not plug or unplug cables, organize wiring, or touch terminals while powered on.

The BOOT button is indicated in the figure:

  1. Keep the toolboard completely powered off.
  2. Press and hold the BOOT button.
  3. Connect the toolboard to your computer or host using a USB cable that supports data transfer.
  4. Release the BOOT button once the device is detected.
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Flashing Firmware​

  1. Confirm that the device has entered UF2 flashing mode, and a removable disk named RPI-RP2 appears on the computer.
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  1. Release the BOOT button or remove the BOOT jumper.
Windows file extension display

Windows may hide file extensions. Please check "File name extensions" in File Explorer, and confirm that you are using .uf2 firmware; do not modify the firmware extension.

  1. Download the Flash erase firmware:

The directory of the erase firmware in the repository is:

FLY-Firmware/RP2040

  1. Copy nuke_universal.uf2 to the RPI-RP2 disk to erase the old firmware already present on the device.

  2. After the copy is complete, the RPI-RP2 disk will automatically disappear; after the device erases the Flash, it will appear again as an RPI-RP2 USB drive, and at this point the Flash is already empty.

  1. Download the FLY-TOOL-LITE CAN Katapult firmware:

The firmware directory in the repository is:

FLY-Firmware/ToolBoard/TOOL-LITE
  1. Copy the Katapult .uf2 firmware to the newly appeared RPI-RP2 disk.
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  1. After the firmware is written, the RPI-RP2 disk will automatically disappear, indicating that Katapult has been flashed successfully.

Completing the Flash​

Power off before proceeding

After flashing, disconnect the toolboard USB and external power before restoring normal wiring. Do not plug or unplug toolboard cables while powered on.

After repowering, the status LED will blink when Katapult starts normally:

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