For the security model to work, the information has to be irretrievable if the security chip breaks. Otherwise a motivated party can simply solder-on a new security chip to get into a locked phone, or compel google to give up the keys.
I suggest you look into reflowing the security chip. Chances are that it's a solder failure, rather than something more difficult like electromigration or something inside the chip.
For the security model to work, the information has to be irretrievable if the security chip breaks. Otherwise a motivated party can simply solder-on a new security chip to get into a locked phone, or compel google to give up the keys.
I suggest you look into reflowing the security chip. Chances are that it's a solder failure, rather than something more difficult like electromigration or something inside the chip.