How to Clear the Dell Latitude BIOS Password. The BIOS controls the startup operation on your Dell PC if you set a password to lock the BIOS, your laptop wont initialize the bootstrap process unless you enter the appropriate password. The feature is ideal for keeping out unauthorized users up until you forget your credentials. If you still know your password but want to remove the access restrictions from your Dell Latitude, you can do that in system setup. If you dont remember your password, however, you must enter a backdoor code to bypass the lock or consult Dell for support. If You Know the Password. Step 1. Turn on the Latitude and then type your existing password into the prompt to unlock your PC. How To Change Bios Serial Number Dell' title='How To Change Bios Serial Number Dell' />Step 2. Press F2 repeatedly on the Dell logo screen to access system setup. If you set a supervisor password, type the password at the prompt and then press Enter. Step 3. Scroll down to and select System Security using the cursor keys. Press Enter. Step 4. Highlight Password Status and then press or to toggle the option to Unlocked. Step 5. Select System Password and then press Enter twice to clear the password. How To Change Bios Serial Number Dell' title='How To Change Bios Serial Number Dell' />If you set a supervisor password, select Setup Password and press Enter twice. Step 6. Press Esc, then Y to save your changes and exit the BIOS. If You Dont Know the Password. Step 1. Turn over your Dell Latitude and locate the 1. Step 2. Sign on to another PC and browse to the BIOS Master Password Generator for Laptops website link in Resources. Step 3. Enter your service tag into the available field and then click Get Password to see the list of backdoor passwords for your BIOS. Step 4. Write down the password listed next to Dell by Serial Number. Turn on your Latitude and enter this password into the prompt to bypass the lock. The term BIOS Basic InputOutput System was invented by Gary Kildall and first appeared in the CPM operating system in 1975, describing the machinespecific part. Just what to say thanks. This website has been very useful in assisting me in getting my usb to serial adapter to work. On my computer however there are no serial. Tip. If your service tag is only seven digits long, append 5. No Valid Installed Hi Tech Compiler Drivers Windows 7. B to the tag and write down the resulting password. Repeat for D3. B and 2. A7. B. Try each generated password to see which one works. About the Author. Ruri Ranbe has been working as a writer since 2. She received an A. A. in English literature from Valencia College and is completing a B. Shut down your Dell Latitude before searching for the serial number. This prevents damage to mechanical hard drives and optical drives that dont like being. S. in computer science at the University of Central Florida. Ranbe also has more than six years of professional information technology experience, specializing in computer architecture, operating systems, networking, server administration, virtualization and Web design.