IJAZ AHMED wrote:
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>May be when you desingned the PCB, there is something >wrong which did not caught your attention yet.

Possible. Will recheck.

>Carefully check its connections and tell me if you >can read the signature bytes of the chip or it also >shows FF FF FF??

It always returns FF FF FF.

Could it be that read back/verify is not working. Maybe the chip is being programmed but verify does n't work. OK to test this hypothesis?

Aurangzeb