They try and stop the hacks the community have created up to os2.1 by enforcing more anti-downgrade protection in their NEW os but what they do is instead recreate a situation like os 2.0.0, where ti-nspire's were bricked. They better release the update soon, because the longer they leave it, the more chaos there will be.
So major upgrade (just to catch up with Casio, and force anti-downgrade) = Dead Ti-nspires