Upgrade Android 4.4.2 To 9.0 Free -

If the upgrade process seems too risky, consider staying on 4.4.2 but using :

Download the TWRP (Team Win Recovery Project) image specific to your device. Connect your phone to a PC and use ADB (Android Debug Bridge) tools to flash the recovery. upgrade android 4.4.2 to 9.0

What is the of the device you're trying to upgrade? Knowing this will help determine if a stable ROM actually exists for it. Check and update your Android version - Google Help If the upgrade process seems too risky, consider