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The verify operation failed

Other Parts Discussed in Thread: TMS320F2801

hello,friends.
my board is TMS320F2801,CCS3.1,API3.02
when I execute flash operation,the same error always happens:

flash api error #40.
The verify operation failed.
First Fail Address =0x003f7810
Expected Data =0x91ff
Actual Data=0x917f

but the fail address is different,erase and program are both ok,
how can I overcome the problem?Thanks in advance.
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my email is rossi_king@hotmail.com