Unfortunately, it is to directly upgrade an Android device from version 4.4.2 (KitKat) to 9.0 (Pie) using an official over-the-air (OTA) update. Most devices that launched with 4.4.2 never received an official update beyond Android 5 or 6.
: Use the custom recovery to wipe your old OS and install the new one. upgrade android 4.4.2 to 9.0
Repeat the install process for the Open GApps zip file. Unfortunately, it is to directly upgrade an Android
: Given the age of KitKat devices, even a budget modern smartphone will offer significantly better security, speed, and app support than a modified 2013 device. To give you more specific advice, could you provide the make and model of your device? Check and update your Android version - Google Help Repeat the install process for the Open GApps zip file
Upgrading a device from Android 4.4.2 (KitKat) Android 9.0 (Pie)
Moving from Android 4.4.2 to 9.0 offers critical improvements: Android 9 Pie | Specs, reviews and EoL info - InvGate