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Previously, SHSH had no shelf life and could be used an unlimited number of times. But then Apple significantly modified the firmware signing system.īut if before iTunes transferred only the device identifier and the firmware version to the Apple server, then before flashing the iOS device generates a random number, which also participates in the creation of SHSH. Up until the release of iOS 5.0 in the fall of 2011, the availability of SHSH provided a guaranteed opportunity to roll back any gadget to any old version of iOS. If you have saved the certificate for the firmware to which you want to recover, then you will always be able to do it without going through Apple's servers. If it does not, then iTunes will give an error and will abort the recovery process.

The answer comes SHSH certificate is required for the load module (iBoot). When you try to downgrade (downgrade firmware), iTunes server communicates with the company Apple and sends him some of the data on your device, including the unique identifier of its chip. The operating principle of this limitation is simple. For iPhone 2G, iPod touch 1G, and Apple TV 1G SHSH is not used, so these devices can always flash at any available version of iOS. Starting with firmware 3.1.1, signing system was extended to the iPod touch 2G and 3G, and since the release of iOS 4.0 SHSH steel subscribe and iPhone 3G. signing system debuted in the summer of 2009, with the release of iPhone 3GS. SHSH Apple issues a special server (gs.) in response to the identifier of the device sewn, sent him to iTunes. SHSH certificate ( Shsh blobs ) - digital signature, unique to each iDevice, Which is signed by the firmware file before it is poured into the device.

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