Update your 3D printer firmware without a bootloader!

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I also explain how to burn a bootloader to a 3D Printer that doesn't have one yet. But really, you might not even need one!
Use a USBtinyISP as a programmer or re-purpose an Arduino board you might already have to upload anything even to mainboards that do not come with a bootloader installed.
USBtinyISP drivers (Windows)
Get a USBtinyISP
Adafruit
Aliexpress (get one with the cables)
Cheap Arduino boards
Arduino Nano
Arduino Uno
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