How to update your apple device to ios 8....

photocourtesy:tech z

On your iOS device, make sure you're connected to Wi-Fi (you can't download updates over cellular data) and plug it in to a power source.
Go to Settings > General > Software Update
On this screen, you'll see a message telling you your software is up to date. When iOS 8 is released, the message will tell you that a newer version is available. Tap Download and Install.
Now the device will begin downloading the update. Once the download is complete, you'll see a pop-up asking if you'd like to install the update. Tap Install. That's it. When the update is installed, your iPhone will restart.

In case you want to install the update via iTunes, follow these steps.

Download and install iTunes.
In case you already have iTunes, update it to the latest version. You can do this by going to the menu bar in iTunes and clicking Help > Check for updates on a PC or iTunes > Check for updates from the menu bar on a Mac.
Once you have got the latest version, connect the iOS device to your computer. In iTunes, select your device from the bar on the top-right.
Now click on the Summary tab and click on Check for Update.
To download and install iOS 8, click Download and Update.

Sources :NDTV

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