Join Date:Joined: Jul 2013
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It simply is not possible on many devices, but if you are lucky, your device may be supported by CyanogenMod, or some other custom ROM. If it is, you can get custom recovery and install the custom ROM which will bring the latest versions of Android to the table. I would look on your device forums for any information first.
Checking for an OTA the old fashioned way (Settings > About Device > System Updates) might also work if your device is well supported by the manufacturer and/or carrier.