To reset the phone to the default presets, please follow the next steps: Main Menu -> Settings -> All Settings -> Create Backup and Reset -> Reset to Factory Settings.
P7 Xtreme
How can you reset it to default presets?
How the "Turn on mute" feature is being activated?
Solution: Menu>Phone>Press the three horizontal lines under the display>Settings>Settings>Tick "Turn on mute"
How can I view the recently started apps?
To view the recently started apps it is necessary to press the "Home" key until the tabs with the recent started apps is displayed. To close them, it is necessary to slide to the left or to the right on each window.
Can I use another Launcher than the already installed one?
Yes, you can change the phone's launcher by using profile app that can be downloaded from the App Store.
How can I take a screenshot without using a profile app?
To take a screenshot without using a profile app is necessary just to press at the same time the Power and Volume- keys.