This video demonstrates every step to update the new iOS software 7.1.2 in iPhone 4s. You can follow the same method for any iPhone like iPhone 4, iPhone 4s, iPhone 5, iPhone 5C, iPhone 5S etc. The basic instructions are pretty much same.
Make sure to charge your phone to atleast 50% before proceeding with the update. It takes somewhere around 25 to 30 minutes so be patient. This software update is for bug fixes and overall performance improvement.
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