Resetting a BIOS password on an HP ProBook 650 G2 is more restricted than on older models because HP business laptops store security credentials in non-volatile memory that isn't cleared by removing the CMOS battery HP Support Community Official Recovery Methods HP SpareKey

Once you’re back in:

This is a quirky but well-documented trick for older HP business laptops, including the 650 G2.

Before trying anything extreme, check if HP’s built-in feature is enabled.

For most users stuck with a locked HP ProBook 650 G2, is your best bet. It’s free, relatively quick, and works on the majority of these laptops.