After testing dozens of ThinkCentre Tiny models (M700, M710q, M720q, M920q), the most consistent method involves shorting two specific pins on the main IO chip (EC – Embedded Controller) during boot.
This method voids warranties and can damage your PC if done incorrectly. You have been warned.
Older desktops stored BIOS passwords in CMOS and could be cleared by removing the CMOS battery or using a jumper. Modern Lenovo ThinkCentre models often store passwords in firmware NVRAM or on the motherboard’s embedded controller; removing power or the CMOS battery typically will not clear a supervisor or power-on password. lenovo thinkcentre m720q bios password reset
However, a safe checklist if you want to try:
Caveat: On M720q this often won’t help because passwords are stored in non-volatile firmware. After testing dozens of ThinkCentre Tiny models (M700,
The SecureBIOS Recovery Assistant is a utility designed to authenticate the current hardware owner and generate a unique, one-time unlock key to reset a lost Supervisor or Power-on Password, bypassing the need for motherboard hardware replacement.
Before we dive into solutions, it’s critical to understand why resetting the BIOS on an M720q is harder than on a desktop from 2005. Caveat: On M720q this often won’t help because
Bottom line: Pulling the button cell battery off the motherboard for a few seconds will not clear the password on this model.