While true software-based CMOS killing is rare, some malicious scripts attempt to . If the boot block is corrupted, your motherboard will not even POST (Power-On Self-Test). Recovery requires an external SPI flasher and soldering skills.
Most modern "Kill CMOS" tools will:
A fake tool might run a batch script that deletes critical system files like bootmgr , winload.efi , or hal.dll . Your CMOS remains intact, but your OS becomes unbootable. Download Kill Cmos 64 Bits