Some weeks ago, I set a master (administrator) password for BIOS, so that each time I open my laptop, I am getting prompted to enter it (just some safety measure). Recently, I have observed that I cannot change the BIOS settings anymore (not even remove the password), because I am not an administrator, as a BIOS warning says.
Furthermore, because of this problem, I cannot boot from any external media (I wanted to reinstall Linux - boot from EFI USB drive).
I looked in every corner of the BIOS and could not find any relevant setting or even a way to enter BIOS as an administrator. The reset pin on the laptop was not do much help either. I have also tried to remove the CMOS battery, drain all the extra current and put it back after a few minutes, but to no avail.
The last thing I tried was a BIOS update: I launched the update utility from windows, prompted for a restart, I was asked to enter the BIOS password, and after that it booted straight to windows, no update being made.
Thus being said, I would greatly appreciate any idea of what I can try next. Thanks in advance!
P.S.: Laptop is a Lenovo B50-80.