Every news post about the 3.6 says the same thing : it blocks everything (Ndless and what it gives, nLaunch, downgrading) and since TI provided a lot of effort in that, they didn't improve anything else that much.
So, not worth downloading and conflicts (like big conflict) with good (like very good) software.

This except if you have 3.2.4 and J-hardware revision. In that case, you don't have Ndless and such so you may think "I don't care". But it is still not advised to upgrade because of the lack of useful new features and because even if downgrading is impossible on both OSes, it is still more possible with 3.2.4 (due to it having less protections).

Also, if you have 3.1 (or a 3.2 that is not 3.2.4), there's the possibility to install 3.6 without screwing everything up, and also to install a switching pack that would allow you to switch between 3.1 and 3.6 without needing a computer. But you won't manage that with the usual way of upgrading, you need to follow precise steps.

By the way, I don't know what "Ndless" is and am not a Lua coder.....
Did I just screw myself or not?

With 3.6, you get the highest compatibility with Lua programs, but you permanently lose the right to use Ndless 3.1. I don't recommend upgrading.

As for the hardware revision, check the back of your calculator for the serial number. The end is the most important thing. For example, mine ends with P-0411B, meaning that it was manufactured in April 2011 and is hardware revision B.

I asked Critor on TI-Planet, he says that it is still possible through a USB/TTL interface to reprogram the Boot2 3.1 via the dock connector (and gain access to Ndless after installing OS 3.1).
But if you want more details, don't ask me, ask him

Hi,


Some TI-Planet content is available in both english and french.
It should default to english for guests when their computer language is not french.

Once regestired, you can set your preferred language in your user profile.

Anyway, you may ask your question in both french and english - most of us speak english too over there



If you did update your TI-Nspire HW-E to 3.6, then your Boot2 was also updated to 3.2.4.

To freely read PDF you need Ndless which requires OS 3.1
But OS 3.6 forbids you to install OS 3.1.
Thus you need Nlaunch, which makes Boot2 ignore the minimal installable OS version set in memory.
But Nlaunch only works with Boot2 3.1.

You then need to reflash Boot2 3.1.
This requires an external hardware: an USB/TTL interface:


By putting the TI-Nspire in Boot2 receive mode (Doc+Enter+2 while rebooting) and connecting ground, Tx and Rx to three contacts on the TI-Nspire bottom J01/Dock connector, you can reflash Boot2 3.1 with the Hyperterminal software coming with Windows up to Vista.


After this is done you can litterally do everything you want with your calculator, and we have comprehensive tutorials in both french and english for each step

You didn't update to 3.6, did you? If not, just download Ndless and follow the user guide. critor's instructions were only meant to be used if you updated to 3.6 and thereby updated to boot2 3.2.4.