According to the following several steps is very easy to delete all the data.
Step1:Before erase all data,backup important information to your computer
First of all,you need to backup of your important Data or other important files to computer. All deleted Android data will be wiped permanently and it won't be retrieved. Please make backup first.
Step2:Install and run the Android Data Eraser
Run the Android Data Eraser on your computer at first,when the primary window appears, click the button "Erase Your Old Phone". This brings up the data erasing window.
Step 3: Connect Android Device to your computer
Then connect your Android device to computer with a USB cable,you can see the software interface as below.
Step4: Wipe all Data from Android phones or tablets
After finishing scan data from your Android phones or tablets,then go to the lower-right corner and click Erase Now. A dialog comes out. Read the tips and click the "delete" button. Then, click “Start” to wipe all of data from your old Android device directly.
How to USE Phone to Phone Transfer
This site will be regularly updated some information data erasure，see more：http://delete-android-data.weebly.com/