Here is the hard truth about the T470: It uses a with the BIOS password stored in a security chip (Nuvoton NPCE388L) , not the CMOS. Pulling the battery or waiting 30 days does nothing.
The BIOS EEPROM chip is typically located near the RAM slots or under the internal battery. lenovo t470 bios password reset verified
Summary
This is the standard technical fix and involves physically interacting with the BIOS chip: Dump & Patch: Here is the hard truth about the T470:
This method involves using a hardware programmer (like the ) to physically read and rewrite the BIOS chip. lenovo t470 bios password reset verified