In the past, manufacturers sometimes maintained master passwords for service technicians. Today, for security reasons, Lenovo does not have a master password list for the T470.
If you purchased the laptop from a surplus sale or a recycler: lenovo t470 bios password reset
If you only have a Power-On Password and you still remember the , you can remove it easily: In the past
If you have a Hard Disk Password, your only reliable solution is to replace the storage drive. for security reasons