How to root the FP5 and OTA update

Unable to mount data or system error to flash additional zips please reboot recovery to switch to the update slot slot: B Devices on super may not mount until rebooting recovery To flash additional zip please reboot recovery to switch to the update slot tornado slot zip to inactive slot: B Devices on super may not mount until rebooting recovery To flash additional zip please reboot recovery to switch to the update slot

tokyo 888 slot ZIP via TWRP IMG - Flash TWRP via TWRP ZIP