: If you are using a jailbreak or bypass tool, update to the latest version. Developers often release patches to add missing loader files for specific board IDs.
A faulty connection can cause the software to misidentify the device or fail to send the loader.
: If your device is running a very new (or very old) iOS version, the specific loader for that version might not be included in your current software build. How to Fix It
Apple uses internal model numbers for developers and repair tools. The format is iPhoneX,Y :