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application settings, and any applications you have installed will be 
erased. Resetting the phone does not erase any system updates you 
have downloaded. Using the check box provided, you can also select to 
erase all the data stored on your SD card or on the phone's internal SD 
card, which includes files that you have downloaded or copied there, 
such as music or photos.
1. On the Settings screen, touch Backup & reset > Factory data 
reset.
2. When prompted, touch Reset phone, and then touch Erase 
everything. The mobile phone resets the settings to the original 
factory settings, and then restarts.
13.9  Online Update
Your mobile phone has pre-installed the online update function. When there is new 
software available, the version information appears and prompts you to update. You 
can also touch 
Settings
 > 
About phone
 > 
Online update
 to check whether the new 
software is available.
When updating:
1. 
Back up your personal information. All personal information will be 
removed after the update.
2. 
Make sure that your microSD card has sufficient space to store the new 
software version.
3. 
Perform the online update following the onscreen instructions.