First, verify if your manufacturer released an official update. Most devices from the KitKat era (circa 2013-2014) stopped receiving updates at Android 5.0 or 6.0. Go to Settings > System > Software update . Samsung: Check Settings > About device > Software update .
If an official update exists for your specific device, you can find it here: About Phone System Updates Check for Update upgrade android 4.4.2 to 9.0
If your device says it is "up to date" on 4.4.2, no official update to 9.0 exists for your hardware. Google Help 2. Unofficial Upgrade (Custom ROMs) First, verify if your manufacturer released an official