Hi I cannot change any settings in the bios, it’s locked. I bought the laptop on eBay, secondhand, I have registered it under my details, I have contacted the original owner, he can’t remember setting a password and gave me a few passwords to try none of them work. After 3 failed attempts I am presented with a window Admin password error codes but there is no error codes above. I can boot to win10 and can set System password and HDD password but cannot change any settings in the bios. If a dell representative can help that would be great. Thanks.