Sorry to revive An old thread, but i just got the ti nspire cx without the cas. Its been a genuine pain to use it without the cas features that even my old casio non graphing calc had (not All) i mean simplifying square roots. Almost all calculators have thT and a 150 dollar one doesnt, that just shows how money thirsty companies these days are... Pretty sad. I got mine And i upgraded to 3.6 (it was 3.2 before not sure if it was the version that was downgrade locked ) im pretty sure the tutorial two posts above me will not work. If it doesn't is there a way to get the features of cas on there without Os changes? Thank you!