If the update has been released for your specific model and region, you can check in your device's settings and see if you can receive the update. If not, the only way to get it is to flash it yourself, and that involves a little more tech savvy stuff, plus either a valid update ROM for your device or a custom-made ROM SPECIFIC to your device's model. Remember that just because they're called the same, some models might have hardware differences and flashing a ROM for the wrong model might render your device completely useless.