blobsfaq
What's a blob?
They're like golden tickets, but instead a digital signature made by Apple that was saved at the time when the signing window was open. If you possess one (or many), keep them safe.
How do they work?
They can be used in a program called futurerestore to restore to a firmware in which the SEP/Baseband is compatible. To check SEP/Baseband compatibility, check /tag sepbb.
Make sure to not use misleading sites. Stick to reputable sites like ios.cfw.guide and AppleDB.
Regardless of SEP/Baseband compatibility, any/all blobs should be saved for future downgrading abilities.
Can I use other people’s blobs?
No. Blobs are a file containing a special key specifically for that one device to allow downgrading to a specific firmware. Due to the way they work, only Apple can create them for your own device.
Can I save them now?
In general, yes. Blobs can be saved at any time, but it is crucial to save them when Apple releases new firmware, because they can only be saved for versions that are currently signed. There is one exception to this: if you are jailbroken and Apple has unsigned the version you're currently on, you may save onboard blobs for that version.
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