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Hi zsccat,Thanks for your attention. I had two ATmega8a with same problem. So I changed 12v power supplay and tried with an intact ATmega328p and it worked! Its HVPP module broke down when I used first ps (but still works with Serial Programming). my first ps had 16v!! :/I suggest everyone to use a trusted power supply because most fake power supplies have a voltage much different from their nominal voltage.
I tried it several times but uC didn't change.