While Android 9.0 (Pie) brings a modern UI and improved security patches, the RK3229 hardware (quad-core Cortex-A7, Mali-450 GPU) is aging. It was designed for Android 4.4 or Android 7.1. Forcing Android 9.0 onto it often results in lag, stuttering, and overheating. Unless you specifically need the Android 9 API changes for a specific app, Android 7.1 remains the "sweet spot" for this chipset.
To flash any of the top firmwares mentioned above, follow this method: rk3229 android 90 firmware top
Warning: Do not unplug during the process. PC USB ports must be 2.0, not 3.0, for stability. While Android 9
: Newer firmware often includes updated GPU drivers and kernel optimizations that reduce crashing and freezing. Required Tools for Installation Before starting, ensure you have the following: Windows PC : Necessary for running flashing tools. Unless you specifically need the Android 9 API