The explained steps in this Guide will help you to Factory Reset Samsung Galaxy Tab 2 7.0 with model numbers:

Samsung GT-P3100. Samsung GT-P3105. Samsung GT-P3110. Samsung GT-P3113. Samsung Galaxy Tab 2 7.0 GT-P3100 Factory Reset Checklist:

1- This process restores the Android platform to its original state and wipe all your data, So backup all the wanted data (Contacts, SMS, Photos, Videos,… Etc).