Sketch compiles but upload produces the following errors: Warning: programmer wiring fails to specify prog_modes = PM_...; [/home/jim/Documents/Sketches/hardware ...
Optiboot is now installed by default on the Arduino Uno. It can be installed on all older mega8, 168 or 328 based Arduinos. Optiboot is "compatible", in a loose sense, with all versions of the Arduino ...
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