This is often the easiest way. Simply connect your device, and the ECID will be displayed on the main dashboard.
Are you seeing this error on a specific or a system bypass utility? ecid not registered install
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 This is often the easiest way
How to Fix the "ECID Not Registered" Error During iOS Installs see that your ECID is "Authorized