I was developing a firmware for a device, constantly recording and verifying the results and correcting the errors, until a certain moment appeared the error message when trying to record: "avrdude device signature = 0xffffff avrdude yikes invalid device signature", no longer performing recordings. …

avrdude device signature = 0xffffff

johnwasser May 8, 2018, 10:29pm 3

Sounds to me like one of your ISP wires has come loose.

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