1. Enter *#*#001#*#* on the dial pad, find is root=. If is root=1, you need to flash the firmware to recover the system, then you can install it normally;

2. If is_root=0, follow these steps for a try:

a. Change another network or connect to the more stable Wi-Fi, then download & install the update for a try.

b. Clear the data of Download manager and System update.

If it still exists, please seek help from our service center.

Funtouch OS 9.0 is based on Android P and there are some new amazing features and changes in this version:

1. Design: Funtouch OS 9.0 uses a new UI design and color combination to make it look better and more distinctive.

2. Settings: The Search function is added to Settings. Now you can quickly search for the corresponding option.

3. Wi-Fi Hotspot: In previous versions, if the Wi-Fi Hotspot is not connected within 2 minutes, it will be automatically closed. Now you can enter the Settings>Personal Hotspot>Turn off hotspot automatically when no connection is made to set the Auto-off time.

4. Smart Split: Smart Split based on Android P supports more apps. You can find these apps in Settings>Smart Split>Apps recommended to use split screen.

5. Power Consumption History Graph: In Funtouch OS 9.0, the Power Consumption History Graph returns again. You can check the power changes by going to Settings>Battery>Power consumption ranking.

6. Game Cube: The updated Game mode supports more functions, such as Prevent accidental touches, Performance preferred, and Esports Mode(Esports Mode is only supported by some devices), making your gaming experience more enjoyable.

7. Easy Touch: The updated Easy Touch supports to add the apps frequently used and richer shortcuts such as Jot down, Calculator, Screenshot, etc. You can turn it on in Settings>More Settings>Easy Touch.

8. Notification Floating Preview: The notification floating preview is displayed in the form of a floating window which no longer occupies the entire area of the top, giving you a better experience.

9. Messages: Messages supports identifying malicious websites, risky links and other information contained in messages which are identified by i Manager.

10. Phone: Now, Phone is able to identify the country calling code.

Other more features and changes are waiting for you to discover.

Update is usually meant to optimize the system compatibility and stability for the new released phone. It can optimize the existing problems or system bugs. As the system of your phone is better optimized, the updates will get slow. Your understanding is highly appreciated.

Update is usually meant to optimize the system's compatibility and stability for the new released phone. It can optimize the existing problems or system bugs. Some updates will add new features or adjust the current design to optimize the operating experience. The update will not reduce the performance of the phone, nor will it delete the original data in the phone. You don`t have to install the system update, however, considering above situations, we suggest you update your phone to the latest version.

Vivo phones with Android O and higher version support Project Treble.

Warmly Tips: V7 & V7+ do not support Project Treble.

V11 Pro & V11 Do not support 2x optical zoom. But they support 10x digital zoom.

We are so happy to tell you that V11 Pro, V11, NEX, X21, V9 Pro, V9, V9 Youth will be updated to Funtouch OS 9.0 based on Android P. However, there is no specific date information currently. Please stay tuned to our social media channels for hot news. Highly appreciate your support and patience. 

V11 supports LDAC. However, V11 Pro does not support it currently.

Please don`t worry, here are some helpful methods for you:

1. Reboot your phone, then try again;

2. Clear the data of Download manager and System update;

3. Change another stable network, then try again;

4. Access Settings>More settings>Backup & Reset>Restore(Reset) all settings. Don`t worry, no data or media will be deleted.

If above measures are not effective, please feel free to contact us.

They are equipped with LPDDR4X RAM.