I have the Ender 5 and I upgraded from the 1.1.4 board to the 4.2.7 in order to use my new CRtouch but the new board has the wrong firmware on it. How do I flash the 4.2.7 board? Do I have to follow the old way of installing a bootloader with the Arduino IDE and then use that to flash the firmware? The method I'm referring to is in this video https://www.youtube.com/watch?v=aQIg9zxuCvM
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How to flash Ender 5 4.2.7 silent mainboard firmware