Upgrade Android 4.4.2 To 9.0

Upgrading a device from Android 4.4.2 (KitKat) Android 9.0 (Pie)

Android 9.0 requires more RAM than 4.4.2. Older devices with 1GB RAM or less may feel sluggish.

However, always measure risk vs. reward. If your phone has sentimental value (e.g., your first smartphone), keep it on KitKat as a time capsule. If you need a functional daily driver, invest $50 in used hardware.