Everybody likes software updates, especially when it promises improvements in performance. Nokia Belle smartphone users are about to get a taste of such as update as Nokia begins rolling out a Quality Improvement update for their devices.This is a minor optional update which improves the stability of applications developed with QT on your Nokia Belle smartphone, and you can receive the update through the Software Update application on your device or by connecting your device to your computer and obtaining the update using the Nokia Suite.
Please make sure you restart your device after you apply the update.
source - SymbianTweet