Acer Extensa 5420G TravelMate 5520G Service Guide - Page 136

PIN pad Location The system board provides one hardware Pin pad under the keyboard pad. RD/CSD can enable this function by shorting this pad. The Pin Pad location should look as the figure below. 1. Clear Password PIN Pad: Bypassing Password Check Keep shorting the 2 triangle PIN pad as shown above and then powering on the system will force the BIOS to clear Supervisor and User passwords. 2. Clearing HDD password: To decode HDD password error code for unlocking hard disk in a DOS environment. A\> unlock6 XXXXX 00 XXXXX - HDD password error code Unlock6.exe v1.1 2 May 2003 Choice what kind of the password to be generated: 0.) Exit 1.) Scan code 2.) upper case ASCII Code 3.) Lower case ASCII code Enter your choice:2 (Choose 2) XXXXXXX XXXXXXX XXXXXXX Those passwords are master password. 3. Restoring the BIOS through the Crisis Disk 126 Chapter 5