iOS hacker winocm posted a video to demo an untethered iOS 7.1 boot running on an iPhone 4. The devices boots up in verbose mode, and win com shows a few iOS 7.1 UI elements and the build number in the Settings application. However, Cydia doesn’t run on the device. NOTE: this is not an iOS 7.1 jailbreak. Most probably is just root access.
Jump over the break to check out the video…
https://www.youtube.com/watch?v=X3QWRY_k6V0