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A utility hasn't been released that supports such a feature yet, perhaps an update to Redsn0w in the future will provide such a function, and likely only for A4 and earlier devices.
 
It depends on the device.
A 3GS and iPhone 4 can be restored to any version (including the iOS6 versions) if you saved SHSH by using Sn0wbreeze.
But for the the A5+ devices, not possible now, perhaps never.
 
It depends on the device.
A 3GS and iPhone 4 can be restored to any version (including the iOS6 versions) if you saved SHSH by using Sn0wbreeze.
But for the the A5+ devices, not possible now, perhaps never.

Can they've restored to the version they're on once apple stops signing it? Not downgrading.
 
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