If you accidentally register the wrong ECID, that blob is useless for your specific phone.
Locate the field and click it once; it will change to the UDID .
Select the correct radio button indicating whether your code is or Dec . register ecid iphone new
Locate the line item, tap it, and copy it to your clipboard. For Jailbroken Devices
Note: Ensure your ECID is in Hexadecimal format (letters and numbers) rather than Decimal (numbers only). Most registration tools require Hexadecimal. Step-by-Step: How to Register Your ECID to Save Blobs
Your ECID, together with your device’s serial number and IMEI, can be used to prove ownership or to attempt unauthorised activations. While the ECID alone does not grant access to your data, it is a sensitive hardware identifier. Store your ECID and saved SHSH blobs in a secure, encrypted backup – you never know when you might need them for a future downgrade or recovery operation. If you accidentally register the wrong ECID, that
The first problem John faced was finding the ECID number itself. He searched online for instructions on how to locate it, but the guides seemed to be written for tech-savvy individuals, not average users like him. After several failed attempts, he finally managed to find the ECID number buried deep within his iPhone's settings.
Modern iPhones (iPhone XS, 11, 12, 13, 14, 15, 16) use a rolling nonce. Just saving the ECID is insufficient. You must also save blobs with a (e.g., 0x1111111111111111 ).