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Ok, my problem is most probably solved. I just borrowed a Mega from my friend and tested uploading my code. It worked without a problem. I used the same program, the same port, the same cable. Since I can't just separate the 2560 chip from the board (well, I could, but that would be a lot of unneccessary work), i can't test it separately which means I can ...


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Arduino nano has only one hardware serial port. So Serial1 must be a software serial, which you did not mention in your code segment. Software serial can not run at 115200 baud reliably. I would limit Software serial to a maximum of 19200 baud. Try using an Arduino Mega with two hardware serial ports.


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