From Factory Reset
Samsung Galaxy Gio Factory Reset
- Turn off the device. If it is stuck then try to pull out the battery for a minute and then put it back in.
- Press down the Volume key and the Power button.
- Then release the Power button.
- Now a menu appear give you the options to Fastbook, Recovery, Clear Storage, and Simlock. Select Clear Storage. Use the Volume Down button to navigate the menu.
- Then press and release the Power button.
- Finally wait for your device to reboot.