Isn't this a hard reset soft is a normal shutdown. Btw been posted numerious times in all kinds of.threads.
Power off is hold down power button for a few sec until shut down prompt appears. A Full ("hard") reset is hold down power button for 20 - 30 sec.
Though in the strictest sense it is not really a hard reset since there are no user settings and data lost and the software is not reset to the shipped level.