The Prusa CORE One, and the Original Prusa MK4/S, MK3.9/S, and MK3.5/S are equipped with an xBuddy board.
In their factory state, our printers only accept official firmware. To flash any unofficial firmware to the printer, it is necessary to break the appendix seal on the xBuddy board.
However, since there is no way for us to verify or test every single custom firmware on the internet, we disclaim liability for any kind of damage or harm a printer with a broken seal may cause (e.g. in case of a fire).
So, please, don’t mindlessly flash suspicious files!
Before attempting this procedure, carefully review the description and the photo below.
To break the appendix, open the electronics box and locate a safety seal on the xBuddy board, with an exclamation mark on it. Then, take a small flathead screwdriver or very thin sharp pliers and break off the thin middle part of the seal.
Once the appendix seal is broken, flashing firmware can be done following the procedure in the dedicated article on firmware updating.
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