Apple has a custom build of iOS 5.1.1 released for the GSM version of the iPhone 4. Apple released earlier this month (May 7, 2012) from iOS 5.1.1 with some minor improvements, including for HDR-AirPlay pictures and videos. Apparently there were for the iPhone 4 some things forgotten and there was a new build required. iPhone hacker iH8sn0w discovered the update: the version number, build number instead of 9B208 9B206. It is possible that there is a connection with the availability of the Absinthe-jailbreak yesterday. For regular users and those with a different device than the iPhone 4 will change nothing. There is no need to immediately install the update. Jailbreakers must be careful.
Jailbreakers are advised to not to update , as the iCulture forum is to read (including helpful instructions what to do). Build the same baseband as 9b208 9b206. The tethered jailbreak is available for this build, but the untethered jailbreak for iOS 5.1.1 (9B208) on the iPhone 4 yet. According to Apple, the new build especially "improvements and bug fixes." iH8sn0w has the impression that the update was released hastily. He discovered after a brief inspection that a number of libraries in the dyld cache have changed and that new carrier settings have been added.
Have you already iOS 5.1.1 on iPhone 4, you get the update automatically (over the air) sent. You can download it manually retrieve from Apple (IPSW file). You can also use the Settings app on the iPhone 4 retrieve or update the iPhone 4 connect to iTunes.
iOS 5.1.1 was a week after available on 50% of IOS devices present.
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