You should be able to downgrade using the Bambu Handy App. Within the title bar, there’s a Hamburger Button (2nd from the right).
Within that menu you will find the “Firmware Version” submenu. If you scroll down to the bottom, there’ll be a button called “I want to downgrade to a previous version”, where you can select a previous firmware version (01.04.02.00).
After downgrading, the printer will still prompt for a firmware update after each reboot. Just cancel it then.
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