— This question has already been tackled here and here. Make sure to follow the...

— To be able to use the Gmail account, press the Power button for a few seconds ...

— To request a new backup pin, simply press the Power button until the menu...

— Unfortunately, if you don't know the Gmail username and password, the only way...

— It's impossible to unlock the phone if it's not rooted. Root gives you access...

— The only way to get access to your phone is by performing a factory reset...