Puppy error #17520 (XL)

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What happened?

On the Original Prusa XL, communication with the peripheral boards (e.g. Dwarf board) is achieved using the MODBUS protocol. In MODBUS, there are two types of devices: the master and the slave, also known, respectively, as client and server. On Original Prusa XL firmware, the master is the XLBuddy, and each slave is called puppy.

A fingerprint is a unique identifier of a specific version of the firmware. The Original Prusa XL checks the fingerprint of the puppies, to ensure the firmware flashed on the peripheral boards is compatible with the printer, and the boards are safe to use. In case of a problem during this check, the printer will show the message: "Puppy # flashed fingerprint mismatch".

Error name: Puppy fingerprint mismatch

Error code: #17520

The error message will include the name of the puppy that has the fingerprint mismatch. 

How to fix it?

Download the firmware, and transfer it to your USB drive. Make sure to unmount the drive from your operating system before physically removing it.

Insert the USB drive back into the printer and reboot the printer using the reset button directly next to the knob to initiate the flashing procedure. In case the procedure does not start, reboot the printer again by pressing the same reset button, and while the printer is booting up, press once the rotating knob.