Shsh Blobs -

You may often see the term . This is an updated format of the original SHSH blobs, introduced because of improved security mechanisms in newer 64-bit Apple processors. SHSH2 blobs are necessary for modern devices (iPhone 5s and newer) to utilize tools that allow custom firmware installation or "re-signing" of files. How to Save SHSH Blobs

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Device features and functions - ScienceDirect.com

Even if you aren't planning to jailbreak today, saving blobs is a "better safe than sorry" practice. shsh blobs

If you save these blobs while a version is still being signed, you can use them later to trick iTunes (or other tools) into installing that "expired" version. Why You Should Save Them

When you use a community tool like to downgrade your iOS version using your saved SHSH blobs, the tool must also source a SEP firmware package. The catch? The SEP firmware must be cryptographically signed by Apple at that exact moment . You may often see the term

A version of iOS is no longer "signed," meaning you cannot officially restore to it 0.5.2 .

He never updated his iOS again. And every time Apple released a new version, he thought of all the people who clicked “Agree” without knowing what they were losing. Not their data. How to Save SHSH Blobs This public link

During a custom restore process using saved blobs, the target iOS version must remain compatible with the SEP firmware of the currently signed iOS version. If the current SEP firmware is incompatible with the older iOS version you want to install, the restore will fail, or your device will boot without any biometric security functionality.