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Cannot overwrite P89V51RD2 microcontroller

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nikhilele

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i have got 30 used 89v51rd2
when i am trying to load the my program its not responding
but when i am using free chip it is working but with those 30 i am not able to program the chip.

I am using Flash magic for programming
 

both are having problem all 30chips
i observed in few some program is there as in my development board for few chips leds were blinking
 

try to use an external progammer and see if it works.... or read the hex file in all chips???? more over what error you get??? put the snapshot to see......
 

It happens also to me.
I try to check the result when the programming voltage is too high.
 

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