Get a trusted Linux-based Checkra1n ISO (like Bootra1n). Flash the USB: Plug in your USB drive. Open Rufus. Select your USB drive under "Device".
Limited, experimental support for A11 devices (iPhone 8, 8 Plus, iPhone X) with security caveats. checkra1n 012 1 beta windows download portable
It is important to understand that the official Checkra1n team for Windows. The official support is strictly for macOS and Linux. Get a trusted Linux-based Checkra1n ISO (like Bootra1n)
To create your portable checkra1n environment on Windows, gather the following components: Select your USB drive under "Device"
Guide: Running Checkra1n 0.12.1 on Windows via Portable Methods
Note: There is no official, native .exe file for Checkra1n from the original developers (checkra.in). "Portable" versions are typically pre-packaged Linux ISOs designed to run from a USB drive. How to Jailbreak on Windows (Portable Method)
If you find a website offering a direct checkra1n.exe file for Windows, do not download it . The official checkra1n does not exist as a Windows executable. Those files are almost always malware, ransomware, or adware designed to hijack your computer.