To register your ECID and save your blobs, you generally need a computer and a USB cable.
Apple only "signs" specific versions of iOS (usually the most recent ones). Once they stop signing an older version, you can no longer install it—unless you have saved the blobs for that specific version and your specific ECID. By registering your ECID on platforms like or SHSH.host , these services can automatically grab those digital signatures for you while Apple is still offering them. How to Find Your ECID register ecid
Registering your ECID is a "set it and forget it" task that can save your device in the future. Whether you want to downgrade to a faster firmware or preserve your ability to jailbreak, having your ECID registered and your blobs saved is the only way to bypass Apple's restrictive signing windows. To register your ECID and save your blobs,
could mean:
The most popular method for registering ECIDs is using (often a website or a bot like TSS Saver Bot on Twitter/Discord) or desktop software like TinyUmbrella or libimobiledevice . By registering your ECID on platforms like or SHSH