Connect your iPhone with a USB cable to the computer and run IPhone Data Eraser. Then when the program recognizes your device, you’ll see its main window as follows.
iPhone Data Eraser provides three security levels for you to erase data. Choose the one you want and click “START WIPE”.
Low: erases and overwrite all data with zeros.
Medium: all existing and deleted data will be wiped and no one will know the data on your iPhone/iPad/iPod is erased.
High: overwrites the data 3 times to ensure the data cannot be recovered.
After a few minutes, all the data will be wiped permanently. You can get your iPhone as a new one. No one can recover data from it, regardless of using any data recovery software.
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