BQ20z65-R1 Data Flash Write Problem

HI,

I am trying to write to the data flash on a new battery design using the BQ20z65-R1 v1.05, but the aval software does not seem to be able to update the data flash.  When I write to any of the registers they just turn red and revert to their original value.  The SMBus communication works with all the SBS registers being read correctly.

I tried using bqChem and when that tries to write to the BQ20z65-R1 in order to update the chemistry, I get the following error: Writing Chemical Data, bqChemOCX - Fail read Verify, Abourt SubClass83 programming.

I can write to ManufacturerAccess, e.g. turn on the LEDs.

Flags/Status register summary:

BatteryStatus = TCA, TDA, INIT, DSG

OperationStatus = PRES, DSG, R_DIS

Do you know why I cannot write to the data flash?

Many thanks

Steve