: Connect your iPhone to a computer. Click on the Serial Number field under your device name until it toggles to show the ECID .
Every time you restore an iPhone, iTunes or Finder communicates with Apple’s servers to request a digital signature. Apple checks if the firmware version you are installing is still being "signed" (approved). If it is, Apple sends back a unique cryptographic signature called an SHSH blob, which is generated using your device's specific ECID. register ecid iphone new
Legacy iOS Kit, TSS Saver, or blob saving via jailbreak. : Connect your iPhone to a computer
Apple stops signing old iOS versions quickly. You must register your ECID and save blobs immediately upon getting a new phone to ensure you have maximum flexibility. How to Find Your New iPhone ECID (2026 Methods) Apple checks if the firmware version you are
While Apple doesn't make this ID front-and-center, it's a vital piece of DNA for your device. Here is everything you need to know about finding and using your ECID for a new iPhone. What is an ECID?
For advanced troubleshooting or bypasses, users often "register" their ECID on a tool's server.
⚠️ Without correct ECID, the iPhone will be permanently locked (Error 4013/9).