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f2808 with CCS4 running SPRAB69 EEPROM Emulation example now behaves as if flash locked

Dear all,

Does anybody has idea about following issue which was posted in external E2E forum for a while.

http://e2e.ti.com/support/microcontrollers/tms320c2000_32-bit_real-time_mcus/f/171/p/64711/264473.aspx#264473

A customer of mine got similar problem with F2808 recently.

He had some results but, unfortunately it has locked the chip.

When he wants to resend the programme into the chip , following message is shown:
 

C28xx: Flash Programmer: Device is locked or not connected. Operation cancelled.

C28xx: Trouble Writing Memory Block at 0x3f4000 on Page 0 of Length 0x4e8

Cannot write to target

He can not erase the Flash sectors, or unlock the chip manualy using the "On Chip Flash"  tool.
What's wrong with this example?

Thanks,

Wei