We reset/unlock bios administrator password for Dell Precision M4400 Click the link below to buy the code for unlocking your laptop https://bios-fix.com//index.php?resou...with-with-servicetag-1d3b-2a7b-a95b-595b.204/ We need only service tag (system number) to unlock it for example in the photo below the service tag (system number) are: BL9P5Q1-1D3B 7133177-1D3B or Add my skype: [email protected] WhatsApp: +16176147065 Join telegram channel : https://t.me/unlock_bios After payment processing, your master password will be sent immediately (to your email and PayPal email address) After entering your password, press the left Ctrl key and continue holding it, press Enter key twice. We send to you the password and you must type it on password prompt and then the laptop gets unlock