Why Is There No iPhone 9? The Real Reason Apple Skipped It - RefurbMe

This article explains what this error means, why it appears, and how to resolve it.

This cryptic string typically appears in specialized flashing, jailbreaking, or advanced restoration tools (such as certain forks of iTunes, 3uTools, MagicCFG, or SSH-based loaders). The message indicates that the software you are using does not contain a compatible bootloader, iBoot, or device-specific loader file for your specific iPhone hardware.