Before you can register it, you need to find the number itself.
If iTunes/Finder receives a "No" to either question, you get the "ECID not registered" error. ecid not registered install
Ensure your device is in before starting the process. Before you can register it, you need to
The "ECID not registered" error is also a historical artifact from the era of . Even today, if you try to restore an unsigned version (e.g., iOS 15.0 when Apple only signs 18.0), iTunes will reject it. In older iTunes versions, the error message was mislabeled as an ECID issue. Before you can register it