Along with Apple Watch presentation, the Cupertino-based company officially announced the public launch of its new firmware version. iPhone, iPod touch 5G and iPad owners can install iOS 8.2 using one of the two methods available [if you had time to install the second beta of it before Apple stopped signing it you can jailbreak iOS 8.2 beta 2 and not install the public version yet]. The first one is to choose OTA update directly from the iDevice. The second way is to use download links for iOS 8.2 public version.
If you want to connect to Internet and update over-the-air, it is simple to do but you should note that Apple servers can be down if there are too many users who are willing to do the same.
How to Upgrade to iOS 8.2 via OTA:
Step 1. Launch Settings app on the iPad or iPhone.
Step 2. Choose General tab.
Step 3. Select Software Update to download iOS 8.2 right from your iDevice.
iOS 8.2 Direct Download Links:
iOS 8.2 ipsw download is good for users who don't like to wait on Apple servers and wish to save the firmware file on their computer and update via iTunes. This is faster than OTA update in most cases. Select your device and its model from our list and use the link to grab the new operating system version for your iDevice.