To use this tool, you must first create a bootable environment. You can use popular utilities like Download the ISO
DEBUG O 70 2E O 71 FF Q
: Restart your PC and press your manufacturer's boot menu key (often F12 , F11 , or Esc ) to select the USB drive as the primary boot device. Step-by-Step Usage Guide pc cmos cleaner 2.0 usb boot
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Follow these steps to turn a standard USB flash drive into a live deployment tool. Step 1: Format the USB Drive Insert your flash drive into the functional computer. To use this tool, you must first create
The older standard was to store the password in the , which is volatile and powered by a small coin-cell battery on the motherboard. Clearing the CMOS (by removing the battery or using a jumper) would wipe the password. PC CMOS Cleaner 2.0 was designed to interact with this type of volatile memory.
After PC CMOS Cleaner executes its wipe command, your system settings will be entirely blank. Follow this sequence to stabilize your hardware configuration: 1. Remove the Drive and Power Cycle This link or copies made by others cannot be deleted
By writing specific values to I/O ports 0x70 (CMOS address register) and 0x71 (CMOS data register), the tool corrupts the CMOS checksum just enough that the BIOS sees it as "invalid." On the next reboot, the BIOS automatically resets to factory defaults—including clearing any password.
You will see a simple menu:
The original PC CMOS Cleaner used a simpler DEBUG.exe script. Version 2.0 automates the process with a pre-configured bootloader. It works on legacy BIOS (Pre-UEFI) and many modern UEFI systems in legacy CSM mode.