Question on SHSH and blobs. New to jailbreaking.


macrumors member
Original poster
Feb 26, 2004
SHSH? Blobs? What are they? Should I back them up? Very new to jailbreaking.
My iphone 4S is jailbroken with the new greenpois0n.
I have the Pkgbackup program. It has an option for SHSH backup and talks about blobs.
Should I select those backup options?
What benefit does it provide?
What would I do in the event my iphone gets upgraded to 5.1 accidently? How would I use the blobs or SHSH to get my phone back to 5.0.1?

Sorry for all the questions......very new to jailbreaking.


Feed Me

macrumors 6502a
Jan 7, 2012
Location Location

Okay, basically, whenever you change the firmware your device is running (by updating, restoring, etc), iTunes will contact Apple's servers to obtain the unique SHSH blob for the firmware and your device. Without this SHSH blob, your device's firmware can't be changed.

Apple traditionally only provides these SHSH blobs for the most recent firmware (5.0.1 in this case) - which means if you want to downgrade your firmware to anything before 5.0.1 - the restore will fail.

Saving these SHSH blobs as they become available is therefore the only way to enable yourself to be able to downgrade firmware (if for instance you accidentally update and can't jailbreak). Apps like TinyUmbrella (PC/Mac) will allow you to use your saved SHSH blobs to restore, exactly as if Apple was providing them.

This was all true until iOS 5 came out, which added extra security features to stop the use of saved SHSH blobs. For a 4S user like you, SHSH blobs currently have no use whatsoever. For people who have older devices, SHSH blobs can still be used to downgrade to iOS 4 and below.

The current advice is to continue saving your SHSH blobs regardless, as jailbreak developers may as yet find a use for them.

Hope this helped. :D


macrumors regular
Oct 23, 2006
Hey squashy-

When I open up the absinthe app the jailbreak button does not let me click it..
What could I be doing wrong?

iphone running 5.0.1
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