De Rebus Antiquis

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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.

DRA is not available on 64-bit devices. It was patched in iOS 8 but may work on iOS 6 or earlier.

See also

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