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, ...
Fixes incorrect hotend thermistor configuration in stock firmware Adds mesh bed leveling support for uneven print beds Improves upon Anycubic's basic touchscreen implementation Updates from old Marlin ...