Connect your device to your computer and open 3uTools. On the main "Device" tab, you will see the ECID listed. You may need to click it to toggle between Hex and Decimal formats (the tool usually requires Hex ). Step 2: Registering the ECID (The UPD Method)
Remember, this tool primarily works on devices from the iPhone 5s to the iPhone X running iOS 12 through iOS 14.8. For iOS 15 and 16, you may need the updated Ramdisk versions of the tool. register ecid frpfile upd
Once submitted, go back to the FRPFile tool, disconnect and reconnect your device, and check if the "Registered" status has changed to Yes . Step 3: Running the Bypass Connect your device to your computer and open 3uTools