The bootloader is a chunk of code on the printer's microcontroller that allows for firmware upgrades over USB.
Creality neglected to install a bootloader when they built the original CR-10. You will need to install the bootloader yourself in order to upload new firmware to the printer
The CR-10S (the new version of the CR-10) already has a bootloader installed. If you have a CR-10S then you can skip this step.
Flashing the bootloader requires a special tool capable of programming AVR chips.
Follow our separate guide for flashing the bootloader on your printer.
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