You may need to reset your Samsung Galaxy S2 Skyrocket smartphone if it is malfunctioning. You can soft reset the device if it is simply frozen and won’t respond to commands. A hard reset will erase all data from the device and set it back to factory default settings.
If the phone will not power off normally, you can simply press and hold the Power/Sleep button for 10 to 20 seconds. The device should be forced off and allow you to power it back on normally.
Hard Reset from Recovery screen
These steps are handy when the device will not boot successfully into the Android OS.
1. With the phone powered off, simultaneously press and hold the Power, Volume Up and Volume Down buttons.
2. When you see the Samsung logo appear on the screen, release only the Power button.
3. Release the Volume Up and Volume Down buttons once you see the Android System Recovery screen appear.
4. Toggle the selection down to highlight wipe data/factory reset using the Volume Down key. Press the Power button to make the selection.
Be patient while the device is wiped. You will eventually be prompted to reboot the phone.
Hard Reset from the Android OS menus
1. Choose Settings > Privacy > Factory data reset.
2. Check the Format USB storage option if you wish to erase data such as music and photos from the device. (Not required)
3. Select Reset phone > Erase everything.