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.
Here’s a step-by-step guide for using as a USB bootable tool. This utility is typically used to reset BIOS/UEFI passwords, clear CMOS settings, or unlock locked motherboards. pc cmos cleaner 2.0 usb boot
The software has not seen significant updates in years. By writing specific values to I/O ports 0x70
Once booted, you’ll see a simple menu: The software has not seen significant updates in years
exists from major motherboard or BIOS vendors. The name appears in some third-party tools, DIY boot disks, or older forum posts — often as a renamed DOS utility or batch script that clears CMOS by writing to I/O port 0x70 / 0x71 or resetting BIOS configuration data.
CMOS (Complementary Metal-Oxide-Semiconductor) is a small memory chip on your motherboard that stores basic configuration data, such as date, time, and hardware settings. Sometimes, CMOS can become corrupted, causing issues with your PC's boot process. This is where a CMOS cleaner comes in handy. In this article, we'll explore PC CMOS Cleaner 2.0 and how to use it to create a USB bootable drive to reset CMOS.
A: No. It only resets CMOS memory. Your OS, files, and partitions remain untouched. However, it may reset SATA mode from AHCI to IDE – Windows may bluescreen. Just change it back.