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Jtag communication failure with LPC 2939 evaluation board

hi,

while loading some sample program suddenly I got the Jtag communication failure problem after that I am not able to load any program using Jtag.

I have gone through the Keil support and come to know that some random program is being executed. to earse the flash memory of LPC 2939 I have searched for serial programing utilities but I could not find any tool.

I request everybody please let me know if there is any tool available for earasing the flash memory of LPC 2939.

any sugession is greatly apriciated.

thank you