why ti, WHY
This sucks, but i hope we'll still somehow be able to re-write it, maybe they accedently opened a hole somewhere with all the additional protection......

The PTT mode is nothing but a half-measure. Since 2010, it shouldn't be deemed sufficient anymore by any competent standardized testing regulation authority.
If it is really important that students do not use an OS with a CAS (instead of making exams less silly and less disconnected from real-world usage...), then the only proper solution, as far as the Nspire series is concerned, is to reformat the entire NAND Flash memory, and reflash the calculator with a special OS version tailored to the exam's restrictions, right from the exam room. This removes the need for a PTT mode altogether.

Of course, proper solutions cost money, and the current half-measures are cheaper, but hey... that's where the silliness of the whole standardized testing system restrictions (which, sadly, remains the norm in many important countries), combined to the insanity of TI EdTech's management (who keep pushing in the wrong direction, despite the prospect of huge financial losses), leads.

BTW, 3.2.4 is quite "nothing" for an update.

The actual real next step is this september's 3.6 OS. (And still, from what I've seen some things change and some don't.... So don't expect too much in minor versions.)

That's stupid. TI knew people would try to erase their OS, the function is there and is easily accessible, and they knew by setting the minimal OS version to one more recent than the latest on the website people would effectively brick their calc. I'm pretty sure they know that, there's a brick button easily accessible people would accidently click on, at a few days of the exams. But why?

I thought about hacking the version number on an earlier OS update, but I think it would reject it because of the signature and all.

And I'm pretty sure nobody knows what is PTT in Canada.

Well, to be honest, the 83+/84+ series has had the possibility of a third-party CAS for a long time and it hasn't been done yet, so they probably aren't too worried.

Actually, probably they intend the Nspire series for those who needs security and anti-cheating features and also advanced features like a CAS while the TI-83+ series is for those who don't care about that and only needs something simple.

my teachers at school don't even know that PTT exist (we have ti 84+'s)

on my school(Portugal) is the same... but the most part of us uses ti-nspires...