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I'm trying to upload marlin to my A8 but keep encountering this error. I have the right driver installed and I have the right board selected but I think this is a version error but I can't find any documentation on which version of arduino is compatible with Marlin.
I think the problem is that you are using the Optiboot Loader, and should be using just the Anet A8 Ver. 1 setting.
I had a problem flashing my AA8 before too and it turns out that newer versions of arduino was not compatible. One site I found pointed out that version 1.6.8 is our best bet. And it was. It worked for me so I hope it will for you too. GL
You should be using 1.6.5.
There ya go. Common problem for AA8 I think