TMS320F2802: New F2802 device is depleted

Hi Champs,

My customer found their brand new F2802 cannot be programmed with the follow console information. The failure rate is about 3/1000. 

The programming tools are XDS560(by 3rd party called SEED) and CCS3.3. The device cannot be recovered using Uniflash Depletion Recovery.

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[12:06:32] Operation Erase Flash returned.

[12:06:40] Begin Erase Flash operation.

[12:06:40] C28xx: Erasing Flash memory...

[12:06:49] ERROR >> C28xx: Flash Programmer: Error erasing flash memory. Error erasing Sector C

[12:06:49] Error executing Flash operation "Erase": Unknown error

[12:06:50] Operation Erase Flash returned. 

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The checksum of failure device is as follows. Looks the device is never programmed. 

Would you kindly help to comment the root cause of the failure?

Thanks.

BR,

Young