1) External Memory Card Storage - such as TF / micrSD card.
- If your device support memory card, remove the memory card from your device. Keep it. Some smartphones have the memory card hidden inside the phone, near the battery. Read the device user or service manual to make sure of that.
- On your Android system, go to "Settings". Find the item "Privacy". Make sure your data is backuped. Use the "Back up my data" option to backup your data first. To proceed with the personal data erase, find the under Personal Data the option "Factory data reset (Erases all data on MID)". Press and confirm.