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De Rebus Antiquis
De Rebus Antiquis (DRA) is an exploit in iOS 7's iBoot that abuses a recursive stack overflow bug. The exploit was developed by xerub. Tools such as powdersn0w can use this to achieve untethered downgrades on any 32-bit device you have iOS 7.1.x SHSH blobs saved for. This is most useful on the iPhone 4.
It was patched in iOS 8 but may work on iOS 6 or earlier.
See also
iOS 5 HFS Heap Buffer Overflow, another iBoot exploit that can be used for untethered downgrades
External links
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