18 Backup, restoration, and update
18.1 Why does the online update fail?
1. Check whether your phone has been rooted and the pre-installed applications have been
removed or some system files have been modified. If so, perform the update using a
microSD card.
2. Check whether your phone's internal memory or the microSD card's memory is
insufficient. If so, free the memory and try again.
3. Check whether a microSD card is installed in your phone. If so, the microSD card may
not be compatible with your phone. Uninstall the microSD and try again.
4. Check whether your phone's battery level is at least 20%. If not, charge your phone.
18.2 What can I do if my phone fails to download the
available update package?
1. Check whether your mobile or Wi-Fi network is disabled. If so, the download will not be
able to start.
2. Check whether airplane mode is enabled.
3. Check whether you have touched the pause button.
18.3 What can I do if the system update notification is still
available after my phone has just been updated?
Make sure your phone is connected to a mobile or Wi-Fi network after the update.
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