How do I reset the complete BIOS of a Terra-Mobile 1515 notebook?

I have already spent the last few days and hours researching how to reset the BIOS of the Terra Mobile 1515 notebook. By default, of course, I've tried to remove the CMOS battery for a few minutes and even days.

The problem here is that it recognizes that the battery has been removed, but it uses the NVRAM to replay the BIOS with all configurations, including the password. This is also my main reason why I want to reset the BIOS at all because I don't have the BIOS password.

In addition, it does not provide a code that can be used to read a password, such as in the case of Acer notebooks. I thought to myself, I'll just try my luck here.

Btw I didn't even know about the acer security code and website to recover lol. But the meaning is unclear to me. Then I don't need to set a password either lol but not for all laptops.

Who secured the BIOS with a password? - A previous owner?
Then I would get in touch with him.