Resetting the Ti-Nspire CX 2 or Ti-Nspire CX CAS 2 is slightly different from resetting the Ti-Nspire CX : while you do press down the RESET button on the back for 5 seconds you must also press down the 4 buttons “EE”, “doc”, “enter” and lastly “on” . Then wait for 1 second to select option 1: “Format / Reset to Factory Settings.”