Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Apple Release iOS 6.1 For iPad, iPhone, and iPod touch
Apple has just released iOS 6.1 for iPad, iPhone, and iPod touch to the public. The public release comes just days after Apple seeded iOS 6.1 beta 5 to developers.
iOS 6.1 brings improvements such as extended LTE support, The ability to download individual songs from iTunes Match and Siri/Fandango movie ticket support.
The update is currently only available OTA and can be accessed by heading to Settings, then General, then Software Update.
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Apple released the following press release for the update:
CUPERTINO, Calif.–(BUSINESS WIRE)–Apple® today updated iOS to version 6.1, adding LTE capabilities to 36 additional iPhone® carriers and 23 additional iPad® carriers around the world, so even more iPhone 5, iPad mini and iPad* with Retina® display users can experience ultrafast wireless performance** to browse, download and stream content at blazing fast speeds. To date, iOS users have uploaded over nine billion photos to Photo Stream, sent over 450 billion iMessages and received over four trillion notifications.
“iOS 6 is the world’s most advanced mobile operating system, and with nearly 300 million iPhone, iPad and iPod touch devices on iOS 6 in just five months, it may be the most popular new version of an OS in history,” said Philip Schiller, Apple’s senior vice president of Worldwide Marketing. “iOS 6.1 brings LTE support to more markets around the world, so even more users can enjoy ultrafast Safari browsing, FaceTime video calls, iCloud services, and iTunes and App Store downloads.”
iOS 6 features include Siri®, which supports more languages, easy access to sports scores, restaurant recommendations and movie listings; Maps with Apple-designed cartography, turn-by-turn navigation and Flyover view; Facebook integration for Contacts and Calendar, with the ability to post directly from Notification Center, Siri and Facebook-enabled apps; Shared Photo Streams via iCloud®; and Passbook®, the simplest way to get all your passes in one place. Additional updates in iOS 6.1 include the ability to use Siri to purchase movie tickets in the US through Fandango, and iTunes Match? subscribers can download individual songs to their iOS devices from iCloud.
The revolutionary App Store? offers more than 800,000 apps to iPhone, iPad and iPod touch® users, with more than 300,000 native iPad apps. App Store customers have downloaded over 40 billion apps, and Apple has paid over seven billion dollars to its incredible developer community. Customers can choose from apps in 23 categories, including newspapers and magazines offered in Newsstand, games, business, news, sports, health & fitness and travel.