Asus ZF3-Abruptuly stopped

I was taking a photo and abruptly shut down. I restarted the phone the battery was 53% a Bitdefender msg. ask me to turn off Web protection and go to Setting and turn on an authorization (no remember which) and than turn on Web protection. After a scan (no malware) only the back button work, in the Setting I tap on Security and the App stop, in the Developer Options say "are not allowed for this user", the notification panel no more come down, cannot connect to my PC as MTP only charge etc. So I can't use the phone in a normal way.

It seems that someone (Bitdefender?) have take possession as administrator.

P.S.: A similar thing happen after I scan my external WD Passport HD, I'm no more the Administrator!!!

Someone can help me?

Thanks Buttons