Blobs - Shsh

Can only be "captured" while Apple is actively signing that firmware version.

In the era of the iPhone 3GS and iPhone 4, blobs were static. You could capture a blob once and reuse it indefinitely. shsh blobs

SHSH blobs are the digital keys that can help you bypass those walls. This guide explains what they are, how they work, and why every iOS power user should be saving them. What is an SHSH Blob? Can only be "captured" while Apple is actively

.ipsw firmware file, and a compatible "SEP" (Secure Enclave Processor) firmware version. Compatibility Check: Downgrading is only possible if the current signed iOS version has an SEP that is compatible with the target version you are moving to. Process: Use the terminal/command line to run FutureRestore, pointing it to your blob and firmware file. SHSH blobs are the digital keys that can

You don't need to be a developer to save your blobs. Several community tools make it a one-click process:

Enabling downgrades to older iOS versions for jailbreaking or performance reasons. Device features and functions - ScienceDirect.com

You can always move to the latest version.