Yet you’ve ascertained that the '16u2 is okay since the loopback works. That said, usually the 16u2 fails before the '328p when you abuse the power rail. Stressing the chip repeatedly can have a cumulative effect and eventually cause it to fail. If you did use an ISP programmer and the upload failed, what error did you get? If you have connected an ISP programmer of some sort to it, and uploaded a sketch that way, it will overwrite the bootloader, and you’ll have to connect it to the ISP programmer and do burn bootloader again.
When you say you used different programmers - do you mean that you attempted to program it with a programmer, instead of doing it through USB? The tools → programmers submenu is only used if you are using a programmer to burn bootloader or upload sketch via “upload using programmer”. Yet you've ascertained that the '16u2 is okay since the loopback works. Does the light give the three-fast-blink pattern of optiboot? If not, that suggests either the chip has failed or the bootloader is otherwise not working. If you did use an ISP programmer and the upload failed, what error did you get?Īssuming you did not use an ISP programmer, remove any connections, plug it into USB, and press and release the reset button. If you have connected an ISP programmer of some sort to it, and uploaded a sketch that way, it will overwrite the bootloader, and you'll have to connect it to the ISP programmer and do burn bootloader again. When you say you used different programmers - do you mean that you attempted to program it with a programmer, instead of doing it through USB? The tools -> programmers submenu is only used if you are using a programmer to burn bootloader or upload sketch via "upload using programmer".
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