How to switch redundancy rootfs A/B

Hi,
How to switch redundancy rootfs A/B by manual. For example, it is run rootfs A by now. I want to switch to rootfs B when reboot, how to do with this?

hello unykey,

it’s update engine, nv_update_engine, it uses the slot metadata to instruct bootloader what slot to boot from, please check developer guide, Bootloader Update and Redundancy.
thanks