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    the purpose of the bootloader is to make upload of the code over UART possible. nothing else. the use of higher language possibility is provided by compiler Commented Feb 18, 2020 at 16:56
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    The compiler itself is not loaded on or run by the microcontroller. For compiled languages, like C, the compiler produces machine code that the microcontroller can run by itself. You're probably thinking of interpreted languages, like Python, that do require an interpreter to exist on whatever hardware is used to run the code. Commented Feb 19, 2020 at 3:11
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    You do realize it's quite simple to program an ATmega328p in C and other languages without Arduino, right? It's part of the megaAVR family and can be reached with the Atmel Studio. Commented Feb 19, 2020 at 8:00