If no official update exists, you can use community-developed software like or Pixel Experience to bring Android 9 to older hardware.
Flashing a new operating system will . Use an SD card or cloud services to back up: Contacts and messages. Photos and personal files. upgrade android 4.4.2 to 9.0
You must be able to unlock your device's bootloader to install custom software. If no official update exists, you can use