So my Ipad has been lock for no reason, I am using this for almost 4 years. But one day when im browsing the internet , it suddenly shut down itself then when I power it up. Boom ! Activation Lock! No idea what happen. Not the original owner but, I erase all the owners data. Then change it to my personal data. When I try to enter my email and pw. It says the "this email cannot be use to unlock this ipad" is there any way to fix this?