To factory reset a Huawei h866c cell phone:
Resetting Your Mobile Phone
12.8.1 Backing Up My Data
You can use your Google account to back up your mobile phone’s settings to Google
servers. If you replace your mobile phone, the settings you have backed up will be
transferred to the new mobile phone the first time you sign in to your Google account.
1. On the Settings screen, touch Privacy.
2. Select the Back up my data check box.
12.8.2 Restoring Factory Data
If you reset your phone to the settings that were configured at the factory, all of your
personal data stored on the phone, including information about your Google Account,
any other accounts, your system and application settings, and any applications you
have downloaded will be erased. 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.
Huawei h866c manual:
Downloads - Huawei Device Co., Ltd..