Q: Does it help with flashing the system of does it help in sharing files WHAT DOES IT DO!!!
A: It does what the fronts one do. You can plug in almost anything that has a memory into the slots. It can be used to view pictures, videos , and music. It also can be used to charge your controller, it can also be used for the wireless adapter. There is nothing special about the back usb port besides that it is the back.