Acer 1820PT - Manual (Page 45)

Chapter 2 35
Removing BIOS Passwords:
If you key in the wrong Supervisor Password three times, System Disabled displays on the screen. See the
image below.
To reset the BIOS password, run clnpwd.exe as follows:
1. From a DOS prompt, Execute clnpwd.exe
2. Press 1 or 2 to clean the desired password shown on the screen.
The onscreen message determines whether the function is successful or not.