If you are not comfortable opening your laptop and working with circuit boards, the safest "verified" method remains contacting for a motherboard replacement or seeking a professional technician who specializes in EEPROM reprogramming.
Check with the previous owner or your company’s IT helpdesk. lenovo t470 bios password reset verified
Lenovo T470 BIOS Password Reset: Verified Methods and Troubleshooting If you are not comfortable opening your laptop