This video demonstrates step by step on how to restore a Android tablet without a hardware volume button (such as the Proscan PLT7223G). This method should be used when his/ her pass code, lock pattern is forgotten, or if the tablet is locked out from to many attempts. Doing a factory reset on is the only way to resolve this issue. This will allow you to bypass the locked screen.
Factory Reset on Proscan PLT7223G or Tablet w/o Vol Rocker