Apple has released iOS 8.1.1 for download.
This release includes bug fixes, increased stability and performance improvements for iPad 2 and iPhone 4S.You can apply the update over the air by going to Settings > General > Software Update.
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iOS 8.1.1 Compatibility list : Please note iOS 8.1.1 is available as a free upgrade for the following iOS devices:
- iPhone 6, iPhone 6 Plus, iPhone 5s, iPhone 5c, iPhone 5 and iPhone 4s
- iPad Air, iPad 4, iPad 3 and iPad 2
- Retina iPad mini, 1st gen iPad mini
- 5th generation iPod touch