Run the ToolKit by double-clicking the the ‘Samsung GS3 Mini ToolKit’ shortcut. Make sure your phone is booted and plugged in via USB cable. The tool will ask you if you want to update it. Type “no” and press Enter key. On the next screen you will have to select your phone’s model number and OS software version.
Tap Settings . Scroll down and tap General . Scroll to the bottom and tap Reset . On the Reset screen, tap Erase All Content and Settings . If prompted, enter the passcode set on your phone . The screen displays a warning that all music, other media, data, and settings will be erased. Tap Erase to continue.
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how to factory reset samsung galaxy s3 mini