BQ25792: BQ25792 default register setting, how to change

Hi,

When the host system is power on, the host can change BQ25792 register by I2C. But when the system is power off, no I2C communication. How to change the default register setting or how to save setting before power off.

For example, the default ICHG for 3 cell is 1A. I2C can change it to bigger current 2A. But after system power off, while the adapter is still on, how to maitain the 2A charge current?

Thanks a lot!