Copyright (c) 2019 Arduino SA. All rights reserved. This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General ...

Optiboot (an older version) is installed by default on the Arduino Uno and (as of 2018) official Arduino Nano boards. It can be installed on all older mega8, 168 or 328 based Arduinos. As of 2019, ...