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, ...
Most end users should find a supported "Arduino Core" that includes Optiboot for their desired target, and install that. Many such cores are provided by the hardware vendor, and they'll include Board ...
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