I bought a batch of 5 chips off ebay and it seem all can be written to , verified, and read from. When I plug it it to the system I get unknown device. But one chip that I have works fine. I have tried reburning those 5 with no luck. I tried reburning my good chip and it works fine. The chips are identical. I was thinking could it be locked? I dont know what a locked chip means, but heard its bad. If so can it be unlocked?
Sorry new to avr toys.