Huawei U8800-51 - Manual (Page 71)

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Managing Your Mobile Phone
Resetting the phone does not erase any system software updates you have
downloaded or any files on your microSD card, such as music clips or photos.
1. On the Settings screen, touch Privacy > 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.