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BQ28Z620: Data flash, charging and discharging

Part Number: BQ28Z620

Tool/software:

Dear TI Team,
I am able to turn the charging and discharging FETS successfully using MACSubcmd() but it does not work once battery has been disconnected and connected again.
I read in the Technical Reference Manual that MACSubcmd() writes only to the RAM, so my questions are
1) Where & how do I write to the data flash to keep these FETS permanently on ?

2) Which register should i write to control the charging current ?  

I am controlling this with an STM32 microcontroller.