Before fixing it, it helps to know what you’re looking at. stands for Exclusive Chip ID . It is a unique 64-bit identifier specific to every individual iPhone, iPad, and iPod Touch.

ECID can be shown in Hexadecimal or Decimal formats. Ensure you are copying the version the website asks for (usually Hex).

When you see this error in a third-party installation tool, it usually means:

Unlike a Serial Number or IMEI, which are used for warranty and cellular identification, the ECID is primarily used during the and by the Apple signing servers to ensure that the firmware being installed is authorized for that specific chip. Why Do You Get the "ECID Not Registered" Error?

How to Fix the "ECID Not Registered" Error During iOS Installs

Are you seeing this error on a specific or a system bypass utility?

Relaunch the tool and try the installation again. The software should now ping the server, see that your ECID is "Authorized," and proceed. Important Warnings