Even exclusive firmware has limits. Here is how to fix the famous RK3188 bugs:
The jump from Android 4.4 (API 19) to Android 5.1 (API 22) is more than a visual overhaul. For the RK3188, it represents a fundamental shift in memory management and graphics rendering. rk3188 android 51 firmware exclusive
Warning: Flashing custom firmware voids warranties and can brick devices if done incorrectly. Ensure your device has a NAND chip compatible with the exclusive image. Even exclusive firmware has limits
RK3188 NAND chips degrade over time. Open a terminal (or ADB) and run:
su -c fstrim -v /data
Run this weekly to prevent the device from turning into a "laggy mess." rk3188 android 51 firmware exclusive