I bought a pre-owned PSVita that was on 3.57 and went through all the steps and now I'm finally on 3.65 HENkaku Enso. Can I factory reset to remove his PSN account ??? I went to his PSN profile and deactivated everything there already but when I signed out it said that I can't sign in to my account because his is linked to the handheld. I went back to the PS Store and logged in to his account again. I want to switch to my account...