When a computer or laptop is locked out, you will be presented with a scary “ System Disabled “, “Password check failed. Fatal Error. System Halted” message with numbers. Take note of the number because that piece of information is very important to generate the BIOS backdoor password. All you need to do is to note down the numbers BIOS Password Backdoors in Laptops When a laptop is locked with password, a checksum of that password is stored to a sector of the FlashROM - this is a chip on the mainboard of the device which also contains the BIOS and other settings, e.g. memory timings. For most brands, this checksum is displayed after entering an invalid password for the third time: The dramatic 'System Disabled' message is just scare tactics: when you remove all power from the laptop and reboot it, there are not new penalties such as additional passwords, locks and so on. From such a checksum (also called "hash"), valid passwords can be found by means of...