Every firmware version goes through intense testing to verify that every single feature works as it should. That applies especially to the safety features: for example, if the thermistor readings are outside the limits, the heating stops automatically.
Official firmware is signed with a private key and the printer verifies the validity of this signature before it allows a firmware update.
To flash your own (or a community-made) unsigned firmware, you’ll have to break the appendix on the logic board (called the Buddy board) and move the jumper in a correct position. Breaking the appendix on the Buddy board is irreversible and voids the warranty of your printer’s electronics.
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