If your device is running a newer iOS version than officially supported, go to in the Checkra1n menu and check "Allow untested iOS/iPadOS/tvOS versions" .

While JustATechCheckRa1n0124Windows Best provides expert guidance, there are common mistakes to avoid:

(official method on Windows):

If you need to jailbreak an iPhone 5s through iPhone X on Windows:

Keep the partition scheme as (or GPT depending on your PC's BIOS type) and click Start . Wait for the process to finish. Your USB is now ready. Step 3: Boot Your PC into Checkra1n

The number likely refers to:

: Follow the on-screen prompts to enter Recovery Mode.