I forgot my privacy protection password how to recover?

[Xhejn Tanku]

I have an Oukitel u2 phone and i used with 2 sim cards ones i removed one the privacy protection password pop up and i could not use my phone i proved the i entered at my gmail and prove to recover with Android device manager but it didnt work than i turned off my phone and ive done a hard reset and this didnt work can anyone help me with this problem