Reset Your Lost BIOS Password Without Removing The CMOS Battery

In my last post, I explained about How to bypass BIOS password by removing CMOS battery. Now I'm telling you one more trick to reset it without removing CMOS battery.

Follow these steps:

• Restart your computer in MS-DOS mode.
• When you get to the C:\> or C:\WINDOWS> command prompt, type DEBUG and press Enter.
• A hyphen (-) prompt will appear waiting for you to enter commands.
• Enter the following commands, pressing Enter after each one. Note: the o is the letter o and stands for OUTPUT.
• o 70 2e 
• o 71 ff
• q
• After the q command (which stands for QUIT), enter Exit.

Then try to enter your BIOS at bootup. The password prompt should now be gone and you should now have full access to it again. However, you will now be at the default BIOS settings and may want to change them to your preference.

How To Bypass BIOS Passwords?

The basic input-output system BIOS is the first thing you see when you turn on your computer. As in school/college labs, you would have been gone through BIOS passwords on startup, but some users don't like it as it seems weird. Follow these two methods for bypassing BIOS password:

1. Removing the CMOS Battery
   
   Unplug the PC and remove the battery for 10-15 minutes, the CMOS may reset itself and the password should be blank.
2. Overloading The KeyBoard Buffer
   
   On some older computer systems, you can force the CMOS to enter its setup screen on boot by overloading the keyboard buffer. This can be done by booting with the keyboard or mouse unattached to the systems, or on some systems by hitting the ESC key over 100 times in rapid succession.