I need to perform a factory reset on my Oculus Go that I gave to my husband for Christmas. He used his business address to sign in and he's since retired. He doesn't use the Oculus Go and now I'd like to register it and use on my email address. The directions I received is to perform a factory - reset. How do I do this - no manual. I do have the wand and the Oculus Go now directions on a reset.