Hello all. I recently purchased a Ti Nspire CX (Non CAS)in hopes of being able to tinker with the software and such. But unfortunately when I received it it was already updated to 4.0  I was unable to find anyway to go back to an earlier version.  If there is any way to go back I would love to know. I will appreciate any help that anyone can give me.    

P.S. This is my first thread so sorry in advance if I did something wrong.