Before you open the case, try these low-effort solutions.
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. lenovo thinkcentre m720q bios password reset
Bottom line: Pulling the button cell battery off the motherboard for a few seconds will not clear the password on this model. Before you open the case, try these low-effort solutions
If official support cannot help and other methods fail, these are hardware-level options — proceed only if you accept risk of voiding warranty or damaging hardware. Bottom line: Pulling the button cell battery off
Options:
Do not attempt soldering or EEPROM reprogramming unless experienced.