What APTickets are is essentially the next generation of SHSH blobs. In case this wasn’t a big enough limitation to downgrading iOS devices, in the iOS 5 firmware generation Apple introduced yet another technology to prevent downgrading called APTickets. What is happening is Apple refuses to generate the new hash during the downgrade, meaning the new SHSH blobs cannot be generated. If you try to restore to a lower firmware version, you will get an error because Apple is not signing that specific firmware version anymore. In order to prevent firmware restores Apple only signs one firmware version at a time, which is obviously the latest firmware version available. Whenever you upgrade or downgrade your iPhone, iPod Touch or iPad, new SHSH blobs have to be generated because one of the parts to the SHSH formula is the firmware version. These blobs are essentially gatekeepers and control whether or not a firmware is restorable. On every device shipped by Apple a Plist file is present, this file contains SHSH blobs for different parts of the firmware.
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