Pc Cmos Cleaner 20 Usb Boot Verified Extra Quality ✓

Review: PC CMOS Cleaner 2.0 – A USB Verified Reset Tool

Product Name: PC CMOS Cleaner 2.0 (USB Bootable Edition)
Type: Bootable utility firmware tool
Interface: USB flash drive (FAT32), bootable ISO
Verification Claim: Digitally signed / checksum-verified bootloader

How to Use the PC CMOS Cleaner 20 (Step-by-Step)

Warning: This will erase all BIOS settings, including Secure Boot keys, TPM data, and custom fan curves. pc cmos cleaner 20 usb boot verified

  1. Power down the target PC. Unplug the PSU cable.
  2. Insert the USB drive into a rear USB 2.0 port (legacy compatibility).
  3. Remove the CMOS battery – this is optional but helps drain residual power.
  4. Plug in the PSU and power on.
  5. Immediately enter the boot menu (F12, ESC, or F11 depending on motherboard) or set BIOS to boot from USB.
  6. When the FreeDOS or Linux prompt appears, type: 
    CMOSCLR.EXE /ALL /VERIFY
    For the "20" version, you might see: 
    CMOSC20 --force --iterations=20
  7. Let the tool run. It will display "Writing zeros to CMOS... Verified... Iteration 1 of 20..."
  8. Once complete (status "PASS"), power off. Remove the USB.
  9. Reinstall the CMOS battery (or install a fresh CR2032).
  10. Power on. You should see "CMOS Checksum Error - Defaults Loaded." Press F1 to enter BIOS and reconfigure.

Myth 1: "CMOS cleaner software can brick your motherboard."

False. Unlike BIOS flashing, CMOS cleaning only writes default values to volatile memory. It never touches the firmware chip. Even if interrupted, a simple reboot or jumper reset recovers. Review: PC CMOS Cleaner 2

Technical Deep Dive: How the Verification Works

Most users skip verification, but that’s a mistake. A “verified” CMOS cleaner uses three internal checks: Power down the target PC

Case 3: Malware Attack on SPI Flash

While rare, certain rootkits (like "MoonBounce" or "LoJax") can write BIOS settings to prevent antivirus from loading. A boot-verified USB CMOS cleaner that runs outside of the OS can overwrite these malicious settings.

1. Overclocking Gone Wrong

Incorrect voltage or frequency settings that prevent POST.

4.2 Media Creation

Due to the DOS-based nature of the tool, a simple drag-and-drop copy is insufficient. The following method was used for verification:

  1. Tool Used: Rufus (Version 3.22) / HP USB Disk Storage Format Tool.
  2. Device: SanDisk Cruzer 4GB.
  3. Settings:
    • File System: FAT32.
    • Boot Selection: "PC CMOS Cleaner.iso" (or the extracted .ima file).
    • Target System: BIOS (or UEFI-CSM).
  4. Process: The "Start" process was initiated. Rufus extracted the boot sector and DOS files from the ISO and wrote them to the USB MBR (Master Boot Record).