Sorry, @Machinus, you didn't understand the background correctly: We're talking here about "out-of-the-box" firmwares (i.e. the firmware in brand-new devices). Any OTA or via sideload updated firmwares newer than 5.8.7.0.1 are user firmwares which definitely can not be jailbroken, as they don't allow the installation of the jb'able special factory test build firmwares.
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