Apple's iOS 9 is finally available for download. Features like battery life optimization and keyboard are noticeably enhanced. However, some users experienced difficulties in downloading the update.

In GottabeMobile's report, it highlighted five important things that are notably enhanced in iOS 9 update within the past twenty four hours. Moreover, iOS 9 update looks the same as iOS 8. Inspite of that, it is packed with new features and several enhancements.

One of the key features to iOS 9 upgrade is the battery life, which most users have noticed and complimented on it. As what Apple promised to boost an hour of battery life for iPhone users, it has noticeably boosted iPhones battery life.

On the MacRumors review of iOS 9 enhancements, it mentioned the new improvements on keyboard settings.The shift function has been altered. When to use lower or upper case letters, it is easy to determine since it'll change whether upper or lower case of choice.

Users can also notice the home sharing for music with the new music app and the new Apple Music service are back in iOS 9 update. The iOS 9 will also take up less room than previous updates. Moreover, the default for security codes will be six digits as opposed to four, which makes hacker a bit more difficult.

Every September, Apple boasts its operating system with a plethora of improvements. IOS 9 is the latest operating system of Apple, and was released last September 16, 2015. However, some Apple fans experienced difficulties when trying to download the iOS 9.

According to 9to5mac, other users are still seeing the previous iOS 8.4.1 version and experiencing errors in updating to iOS 9.Though in case to 9to5mac, rebooting its iPhone 6 and checking Software Update in Settings resolved the issue. 

Moreover, it reminded users that the best troubleshooting solution is likely being patient and letting Apple's servers catch up with every major release. However, some users have successfully updated to iOS 9 using iTunes.