Difference between revisions of "Firmware downgrading"

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Downgrading is the process of restoring to an older [[firmware]]. Apple does not allow downgrading unless the firmware is being signed. Downgrading is only possible on [[S5L8930|A4]] or older devices that have [[bootrom]] exploits such as [[Limera1n]] with the exception of iPhone 4s that can be restored from 9.x to 6.x as long as there are valid [[SHSH]] blobs saved for both the iOS the device is on and the one the user wants to get. It is also possible to downgrade an [[iPad 2]] to 5.x with 4.x and 5.x SHSH or 4.x with only 4.x SHSH blobs. iPhone 4s and iPad 2 downgrading will require [[redsn0w]].
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Downgrading is the process of restoring to an older [[firmware]]. Apple does not allow downgrading unless the firmware is being signed. Previously, downgrading was only possible on older devices that have SHSHs saved and are vulnerable to [[bootrom]] exploits such as the [[limera1n Exploit]]. However, it has become possible to downgrade devices with no (known) bootrom exploits to certain firmware versions, such as remaining on iOS 5.x or downgrading to iOS 6.1.3. It is also possible to downgrade an [[iPad 2]] to 5.x with 4.x and 5.x SHSH or 4.x with only 4.x SHSH blobs. iPhone 4s and iPad 2 downgrading will require [[redsn0w]].
   
 
== Reason for downgrading ==
 
== Reason for downgrading ==

Revision as of 01:31, 20 October 2015

Downgrading is the process of restoring to an older firmware. Apple does not allow downgrading unless the firmware is being signed. Previously, downgrading was only possible on older devices that have SHSHs saved and are vulnerable to bootrom exploits such as the limera1n Exploit. However, it has become possible to downgrade devices with no (known) bootrom exploits to certain firmware versions, such as remaining on iOS 5.x or downgrading to iOS 6.1.3. It is also possible to downgrade an iPad 2 to 5.x with 4.x and 5.x SHSH or 4.x with only 4.x SHSH blobs. iPhone 4s and iPad 2 downgrading will require redsn0w.

Reason for downgrading

Some users downgrade since iOS 7 does not run as people want on older devices like the iPhone 4. This can also be for nostalgia. There's many reasons to why one would want an older iOS.

Restoring to Older Firmwares via Any Method

Downgrade iTunes to 11.0 or 10.7 and then restore when in PwnDFU.