Upgrading a Creality Ender 3 / Ender 5 to Marlin 2.x

Installing the bootloader Before installing any “custom” firmware on your printer, you will need to install or “flash” a bootloader to your board. If you are familiar with Arduino boards, you know that all you have to do to flash a new sketch, is just connect the board via USB cable to your pc, compile and flash. This happens thanks to a small piece of code called the “bootloader” which lives in a specific memory section of the processor. By

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