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my new tms320f2810 devices are locked!!!

Other Parts Discussed in Thread: TMS320F2810

I have bought 10 new tms320f2810 ICs and when I want to  program them, I encounter with this problem in some of them:

the device is locked.

when I connect with XDS510-USB2 to the device, the value of SECURE bit in CSMSCR register is '1' which is means the device is LOCKED.

what is the problem? and how can I solve the problem?

Thanks.