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But they'll send you a K (or higher?) revision calculator.
J and K calcs (the last char at the end of their serial number) cannot run Ndless nor be downgraded below OS 3.2.4 (or even 3.6). If you ever need some Ndless programs like mViewer and have such calc, then you're screwed. TI totally locked them down.
Yes, you have an E, which is safe and is not locked down. (One of my Nspires is E, and I have Ndless and nLaunchy on it).The 3.2.4 and 3.6 OS's were found hidden on TI's website. I don't know why it still gives normal users version 3.2.3. Never install 3.2.4, since it's completely locked down. And don't install 3.6 without using nLaunchy 2.3.Here's some news items about these locked down OS versions and hardware revisions:http://ourl.ca/19743http://ourl.ca/19500http://ourl.ca/19073