How to remap Xbox 360 Controller???

Hi, new to 360 modding community. Just revived my old xbox 360 and looks like the START button on the controller is not working. Can I somehow remap the START button with BACK button??? Any homebrew app to do this??? It's a modded console.

I have somehow found the XPREMAP 2.0 Dashlaunch plugin. But I don't know how to use it. Any old user can help me with that???