If you still have "justatech checkra1n 0.12.4 windows.zip" sitting in your downloads folder, the feature ends with a warning: It is an artifact of a time when users were desperate enough to trust unverified code. It represents the "Wild West" era of the jailbreak community—a time when getting Cydia on your iPhone was worth risking the health of your PC.
The standard Windows USB driver stack (specifically how it handles USB multiplexing and control transfers) prevents the precise timing required to exploit the checkm8 vulnerability. justatech checkra1n 0.12.4 windows.zip