1. Upgrading the system won't delete or change any of your data, but it is still recommended that you make a backup before you start. 2. The installation package will be removed once the installation is complete. 3. After the upgrade, the system will optimise itself in the background to improve your experience. While optimising, your device might get a little warm, slow down or use more battery than usual, which is perfectly normal. Don't worry. It should return to normal in a day or two. 4. The on-screen content (including UIs and backgrounds) shown here is for illustration only. Features and UIs may differ depending on your device, software version or region. 5. If you run into any issues with the new version, please contact our customer service.