Acer ASPIRE 4253 Service Manual page 76

If user is unable to obtain correct password then it must be removed. There are two methods
to do this.
Method 1:
If BIOS menu item Power on Password is set to Enabled, then Crisis Recovery disc
must be used.
Method 2:
If BIOS menu item Power on Password is set to Disabled.
1. Boot to DOS and execute ClearSuPw.exe. (Figure 2-20)
Figure 2-20. Clear Supervisor Password Utility
2. When message Clear the SU Pws completely is displayed, supervisor password
has been removed.
2-20
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System Utilities