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F28M35 F021 Flash API does not erase the C28x Flash memory

I'm also able to program the Flash by using the follwong command of the Flash API F021 version 1.52:

                    oReturnCheck = Fapi_issueProgrammingCommand( pProgMemAddress, buf16, 8,    0,    0, Fapi_AutoEccGeneration);

BUT, I'm not able to erase the Flash - Using Erase_Bank or Erase_Sector, same result.

                    pProgMemAddress = (uint32*)Bzero_SectorN_start;

                    oReturnCheck = Fapi_issueAsyncCommandWithAddress(Fapi_EraseBank, pProgMemAddress);

                    oFlashStatus = Fapi_getFsmStatus();

The resurn value is always "2" = Fapi_Status_FsmReady

The Fapi_FlashStatusType       oFlashStatus = 0

But the Flash memory is unchanged.

F021 - version 1.52 - C28x - CCS: Version: 4.2.5.00005

What  do I miss to Bank erase the Flash?