FAS bit clear problem of bq34z110

Hello!

The following problems occurred during my studying the bq34z110 (With EV2300).

I changed to a mistake Unsealed code "0000 0000", and the Full Access Code "0000 0000" to have changed.

Then [FAS] bit is not clear, [SS] bit is clear.

And I can read the data flash, I can not write.

How to completely reset the bq34z110 in this case?

Or is there a way to clear the FAS bit?