1. Upgrading the system won't delete or change any of your data, but it is still recommended that you back up your data before you start. 2. The installation package will be removed once the installation is complete. 3. After the upgrade, the system will perform deep optimization in the background to improve your experience. While optimizing, your device might get a little warm, slow down, or use more battery than usual, which is perfectly normal. This is normal, and your device should return to normal in a day or two. 4. The on-screen content (including UI elements 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.