through the hidden information values by clicking 1–2 times until the label switches to show your ECID . Right-click and copy the resulting hexadecimal string. Method B: Using macOS System Information Boot your iPhone or iPad into Recovery Mode or DFU Mode.
Encountering the "ECID not registered" error can be frustrating, but it's a specific issue with a clear set of causes. It is not a problem with the user's ability to manage their device, nor is it a typical Apple error. The message is a byproduct of using third-party software that relies on external databases of device identifiers. ecid not registered install
Confirm firmware signing status