If the risk of a hardware brick is too high, use a "Software Workaround" instead of a full BIOS flash.

The supervisor password (SVP) is the master key to a Lenovo computer’s BIOS. If forgotten, Lenovo officially states that there is —users must contact an authorized service provider to have the system board replaced, incurring significant costs for parts and labor. BIOS unlock tools provide an alternative by patching the firmware to bypass or remove the forgotten password.