It is generally to directly upgrade an Android device from version 4.4.2 (KitKat) to 9.0 (Pie) using an official method. Most devices that launched with 4.4.2 stopped receiving updates years ago.
If no official update exists, the only way to reach Android 9.0 is by installing a Custom ROM upgrade android 4.4.2 to 9.0
However, if your device is and has an unlockable bootloader , you can flash a custom ROM. not possible It is generally to directly upgrade
Tap . The first boot takes 10–20 minutes (longer than usual). Do not force restart. After setup, verify sensors, Wi-Fi, Bluetooth, and camera
While improbable for a device as old as version 4.4.2, always check for official updates provided by your manufacturer: Navigate to > About Phone . Select System Update or Check for Updates .
This method is for advanced users only, as it involves flashing a custom ROM, which can potentially brick your device.