Tutorials & Docs
For users on iOS 12.5.5, Checkra1n is the most reliable tool because it supports older devices like the iPhone 5s, 6, and 6 Plus.
Open Rufus, select your USB drive and the downloaded ISO file. Click Start and select Write in DD image mode. Boot from USB: download checkra1n for windows ios 12.5.5
This is the official recommended method for Windows users. You create a bootable USB drive with a Linux distribution (like Ubuntu or the dedicated checkra1n Linux ISO) and boot your PC from it. Once booted, you can run checkra1n natively. For users on iOS 12
Unplug your device and restart your PC to go back to Windows. On your iPhone/iPad running iOS 12