X270 strange problem

I´ve got a used X270 and it came wit a strage bios problem. When i hit F1 it ask for a password but when i just press enter i´m in. But i cannot change any options inside the security menu. Even F9 for roll back to default options don´t work. What can possibly be a reason for that ? btw. i istalled W10 and made a bios update but that does not change anything.