Let iTunes update your hardware to the latest version. Select the IPSW update file you just downloaded. Option+Click (Mac OS X) or Shift+Click (Windows) the Update button. 
Once you have downloaded the IPSW file that corresponds with your iOS device: The iOS update file has downloaded, now what? Note that you will still need to use iTunes to install the iOS update on your hardware.
View all new iOS IPSW versions and files. Select your iOS hardware to get a complete list of iOS updates for that device: You can always download iOS IPSW files without iTunes, and then update the software using iTunes itself. This is by far the easiest way to get the iOS update installed onto a device and requires no computer at all, the whole thing is completed on the iPhone or iPad. If an update is available, tapping on Download and Install will finish the process for you with no attachment to a computer and no iTunes at all. Tap on “Software Update” to see if any update is available for the over the air download. 
In any case, if you are running iOS 5 or later, you can use OTA to update iOS with no attachment to a computer or PC whatsoever. There is a caveat here though, and that is the device must be running system software later than version iOS 5.0, so older hardware may be left out. Thanks to OTA (standing for Over The Air) updates, you can also download updates to iOS directly on an iPhone, iPad, or iPod touch without even using iTunes. Download iOS Updates Directly to the iPhone, iPad, or iPod touch
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