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Do some resaearch and see which firmwares your saved SHSH blob can be used with. These are the firmwares that you can downgrade to.
The primary reason to downgrade is jailbreaking. If this is the case, research the firmware options and see if they can be jailbroken. Try the highest saved SHSH and work your way down.
When you find a firmware that you can jailbreak, download that firmware. Most firmware files can be found here.
Save it in the "downgrade" folder.
iOS 4.2.1 Firmware
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