HT201601: How to use the Apple Product Security PGP Key
Learn about How to use the Apple Product Security PGP Key
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Helpful answers
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May 30, 2015 8:44 AM in response to Kaushik N Falduby ChrisJ4203,You can do it one of two ways, either OTA via the phone, Settings>General>Software Update, or you can connect the device to the computer and iTunes and click on Check for Update, and follow the prompts.
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May 30, 2015 8:46 AM in response to Kaushik N Falduby Averythomas,You can only download and update to the latest iOS version 8.3