Easy ways to fix that problem,i got you. Power off your phone, then volume up the volume until the Fastboot shows up, click Recover and click wipe data then click Restore all and click Reboot System and there you go Warning:don't click under Restore all.
I got it back to OS by keeping it shut down over night, then restarting it with pressing lower button down.. Then just had to wait for the backups to reinstall all apps and msgs.@@hamzz-ji6xt