Start with the computer powered on and plugged-in to your charger. Restart the computer by clicking Restart in the Start menu.
As the computer turns on, repeatedly tap the F1 key near the top left of the keyboard until you see the Entering Setup message.
At the lock prompt, type the password LN18UNTAMED and press ENTER.
Use the left/right arrow keys to navigate to the Restart screen.
Highlight Load Setup Defaults and press ENTER.
Press ENTER again.
Use the left/right arrow keys to navigate to the Security screen.
Highlight Password and press ENTER.
Highlight Supervisor Password and press ENTER.
Enter the current password, LN18UNTAMED and press ENTER.
Enter a new password or leave it blank. Press ENTER.
Repeat the new password or leave it blank. Press ENTER.
Press ENTER to continue.
Press the ESC key at the top left of the keyboard.
Highlight Security Chip and press ENTER.
Highlight Clear Security Chip and press ENTER.
At the Clear encryption keys dialog, press ENTER.
Press ESC.
Press ESC again.
Highlight Exit Saving Changes and press ENTER.
Highlight Yes and press ENTER.
When the system boots into BitLocker recovery, hold the power button down for six seconds to power it off.