Make sure it is factory unlocked not carrier unlocked. There is a chip built into the tensor chip in the pixel 8 and up that is a spyng chip (I'm sorry I can't remember the name). Someone at Brax.me can shed some light on it I'm sure. We use Calyx, maybe try flashing calyx just to try it out then change to graphine. I like both systems and both are easy to flash. I feel like calyx is a little more user friendly for my family.