You can downgrade without SHSH?

Discussion in 'iPad 2 Forum' started by BiraNeto, Jun 19, 2012.

  1. BiraNeto

    BiraNeto
    Expand Collapse
    iPF Noob

    Joined:
    Jun 19, 2012
    Messages:
    1
    Thanks Received:
    0
    I know, this must be fairly common question, but again I ask. Is it possible to downgrade without having SHSH?
     
  2. Gerryboy

    Gerryboy
    Expand Collapse
    iPF Novice

    Joined:
    Jun 5, 2012
    Messages:
    24
    Thanks Received:
    0
    Enlighten me please......what is shush I haven't a clue.
     
  3. Bosvaark

    Bosvaark
    Expand Collapse
    iPad Enthusiast

    Joined:
    Jun 10, 2012
    Messages:
    388
    Thanks Received:
    10
    SHSH blobs is a Hash signature system (Signature HaSH blobs) made by Apple Inc. to control manual software downgrades on iPhones, iPads, and iPod touches (a typical prelude to Jailbreaking). An SHSH is created by an SHSH formula (CLI Application) with 3 or 4 TSS keys- the device (e.g. iPhone 4 CDMA), the firmware version being signed (e.g. 4.2.8) and the device's ECID- a unique ID contained within every device. The SHSH is a Plist, built with blobs, with each blob intended for a different part of the software (like kernel and Apple logo). These blobs control which firmware is restorable and which is not. When Apple wishes to restrict users' ability to "downgrade" their devices to a prior firmware version, Apple can simply refuse to generate this hash during the downgrade attempt, and the downgrade will not be successful (or at the very least, will require significant technical intervention).
     
  4. Bosvaark

    Bosvaark
    Expand Collapse
    iPad Enthusiast

    Joined:
    Jun 10, 2012
    Messages:
    388
    Thanks Received:
    10
    Should be as clear as mud now ;-)
     
  5. Mickey330

    Mickey330
    Expand Collapse
    Administrator
    Staff Member

    Joined:
    Aug 30, 2010
    Messages:
    11,864
    Thanks Received:
    2,175
    Here's a good tutorial about SHSH blobs (written by my fellow moderator, f4780y): http://www.ipadforums.net/showthread.php?t=59291

    It's a great read but the simple answer to the first question is no, you cannot downgrade without SHSH blobs if Apple has closed your destination iOS's signing window.

    Hope that helps.

    Marilyn
     

Share This Page



Search tags for this page
downgrade ipad 1 no shsh
,
downgrade ipad 1 without shsh
,

downgrade ipad 2 without shsh

,
downgrade ipad tanpa shsh
,
downgrade ipad without shsh
,

downgrade without shsh

,
ipad 1 downgrade without shsh
,
ipad downgrade without shsh
,
is it possible to downgrade without shsh
,
is it possible to downgrade without shsh blobs