TMS320C6655:NOR Flash read verify failed. Nor Writer code question

Part Number: TMS320C6655

I am redoing Nor Writer with modifications

Trying to use another flash memory

It seems to do memory write

The following error message is displayed in the console

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[C66xx_0] NOR Writer Utility Version 01.00.00.03

Flashing sector 0 (0 bytes of 136164)
Flashing sector 1 (65536 bytes of 136164)
Flashing sector 2 (131072 bytes of 136164)
Reading and verifying sector 0 (0 bytes of 136164)
Failure in sector 0, at byte 0, (at byte 0 in the data file) expected 0x000000ff, read 0x00000040
NOR read verify failed
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I need an answer.

thank you