Hi Kayathri,
Before answer your questions, I'd like to confirm with you about whether the MCU could be downloaded before or not,
I was wondering if you can share the SCH of the debug interface and seek out the issue by yourself through the link as below.
http://mcuoneclipse.com/2014/11/03/debugging-failure-check-list-and-hints/
Hope it helps.
Have a great day,
Ping
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