"SHSH Blobs" - What Are They and Why Are They Important?
Here's how SHSH blobs work:
The white Apple logo on his phone flickered. It didn’t boot. Instead, the screen became a deep, oceanic blue. And floating in that blue were shapes. shsh blobs
He spent the night extracting. The white blob contained the first photo he’d ever taken on that phone—a blurry shot of a rain-spattered window. The purple blob held a text argument with his brother, the one they’d made up from two days later—the hash preserved the raw emotion of the fight, even if the words were gone. The green blob was the strangest: it contained a three-second recording of his own laughter from a forgotten voice memo, a laugh he no longer recognized as his own.
Must be saved while the iOS version is still "signed" by Apple. "SHSH Blobs" - What Are They and Why Are They Important
SHSH blobs are essential for several reasons:
The concept of saving SHSH blobs emerged as a clever circumvention of this restriction. By using tools like TinyUmbrella or TSS Saver, advanced users could intercept and save the blob from Apple’s server while a particular firmware was still being signed. Later, when Apple had ceased signing that version, these saved blobs could be replayed to the device during a restore, tricking it into thinking it had received fresh approval from Apple. In essence, a saved SHSH blob is a time machine—a cryptographic coupon that allows a device to downgrade or restore to an older, unsigned firmware. Instead, the screen became a deep, oceanic blue
Extracting SHSH 12.0.1... Blob contains: "Son, don't worry about the money. Just visit more." [VOICEMAIL HASH]