The jailbreak of iOS 7.1 until today it did not exist, as its circulation brought and signaled his death evasi0n7.
Ο Chippers Winocm he announced at Twitter that he managed to create an “iOS 7.1 untethered boot ”on an iPhone 4 device.
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The device runs on A4 chip, which is known to break first with every new firmware that Apple is running. Newer chips are much harder for "untethered boot"
With a short video uploaded to YouTube, Winocm offers us proof that iOS 7.1 is now jailbroken. However, it is probably very difficult to find a "hole" for the other chips. Note that Winocm has never released a jailbreak tool to the public, nor has it ever stated that it will do so at some point in the future.
Watch the video