Lenovo T420 - Manual (Page 46)

2. When the ThinkPad logo comes up, immediately press F1 to enter the ThinkPad Setup program. When
the POP icon is appearing on the screen, enter the POP.
3. Select Security, using the cursor directional keys to move the menu.
4. Select Password.
5. Select Hard-disk x password, where x is the letter of the hard disk drive. A pop-up window opens.
6. Select Master HDP.
7. Type the current master HDP in the Enter Current Password field. then leave the Enter New Password
field blank, and press Enter twice.
8. Press F10.
9. Select Yes in the Setup Configuration window. Both user HDP and master HDP will have been removed.
40 ThinkPad T420 and T420i Hardware Maintenance Manual