Apple today released the fourth beta of iOS 7.1 to registered developers for testing purposes, following the release of the third iOS 7.1 beta at the beginning of this month. The update has a build number of 11D5134c and is available via an over-the-air update or through Apple’s developer center website. The last version of iOS 7 available to the public, iOS 7.0.4, was released back in November. There are still several known issues for Apple's engineers to address, so iOS 7.1 will likely not be released to the public without at least one more round of beta testing. Today's update also includes Xcode 5.1 Developer Preview 4 and a new version
