If no update appears, your manufacturer has likely ended official support for that hardware. 2. Unofficial Upgrade (Custom ROM)
Turn off the phone and enter TWRP recovery (usually Power + Volume Down). upgrade android 4.4.2 to 9.0
Once finished, flash the GApps zip immediately after (do not reboot between these steps). If no update appears, your manufacturer has likely
However, if you have a compatible device and want to manually install Android 9.0, here is the general guide using a custom ROM (like LineageOS). If no update appears
You must install TWRP (Team Win Recovery Project) for your specific device. Step-by-Step Upgrade Process