I just got my CX CAS and have decided to install Ndless onto it, but I cannot send the OS upgrade. I first tried using the Nspire link software, but that gave the error "Wrong handheld type for OS being sent" (using the file ending in .tcc). I have heard that using the student software will solve this problem, but unfortunately, the student software won't let me send an OS. I can save files to it with the save to handheld option, but the Install OS option in it is greyed out.

Any solutions? I can't figure this out.