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If you are in need of resetting a iPhone, you can use iTunes to make it true. Step 1: Connect your iPhone to the computer via USB cable and select "iPhone" from the toolbar. Step 2: before continuing, click the "Back Up Now" button to ensure your device is backed up before the restore. Step 3: Hold down the "Shift" button and click "Restore iPhone". Step 4: Select the firmware ipsw file from your hard drive in when there is a pop-up, then click "Open". Step 5: iTunes will ask you if you want to restore the iPhone to its factory settings. All of your media and other data will be erased. Click the "Restore" button to continue. Step 6: Wait till the process complete. After resetting your iPhone, if you found some data are lost, you can use FonePaw iPhone Data Recovery to recover your lost data, if you have backed up iPhone data to iTunes or iCloud before.