Input your ECID, select your exact device model, and submit. The server will pull and store your signed blobs automatically. 2. Blobsaver (Desktop Application)
Despite the cryptographic hurdles of the nonce, saving SHSH blobs remains highly popular in the custom modification and jailbreak community. If you save your blobs while Apple is still actively signing a specific iOS version, you preserve a snapshot of the signature required for your device. shsh blobs
The community standard for saving blobs is (often called "TSS Saver") or the tool shsh.host . Input your ECID, select your exact device model, and submit
Apple typically only "signs" the most recent versions of iOS. Once they stop signing a version (usually a week or two after a new release), you can no longer officially install it. Apple typically only "signs" the most recent versions of iOS
Using SHSH blobs is not as safe as an iTunes update. You are actively bypassing security checks. Here are the common failure states:
to downgrade or "sidegrade" to that version later, even after Apple has stopped signing it. Jailbreaking
: This is a separate chip handling security (like FaceID/TouchID). It requires its own signature. If the currently signed SEP is incompatible with the older iOS version you want to downgrade to, the restore will fail or break your biometric security.