Bq27505J5 DFI

I've written a program to load a DFI file into Bq27505J5.  Program seems to run without error.  Checksums and register 66 indicate all is well.  The problem is after programming the DFI , I2C communication is lost.

To verify the DFI is ok, I used BqEasy to load the DFI.  After loading communications work fine.

My program is following the steps in SLUA516 pages 9,10,11.

Thanks ahead of time for any help.