before you use that menu option you need to ensure that the USB link is in a 'connected state', ie, by using Menu 'Link->USB Link Connect' before hand. that OS update file, needs to be a specially prepared OS update file. the OS update must match the version of the OS you have installed in kArmTI, eg for CX CAS the update file has to have the. tcc: TI-Nspire CX CAS Send this file as an OS upgrade to the calculator. to install the previous version of ndless (outdated by now), eg, for ndless-v3.1-beta-r557, you can get the following from its 'How to Install': - Locate the file ‘ndless_installer-.tno|tnc|tco|tcc‘ in the ‘calcbin/‘ directory of Ndless which matches your device type: *. In fact on the back of the TI-Nspire CX, on the right of the serial number, is what is called the datestamp, a 7-character code.That kArmTI-Menu "Link" option "Send OS Update", is there only to send 'special files' like, for eg. If you want to use Ndless or Nlaunch, we'd advise you to give up on purchasing a brand new TI-Nspire CX and to look for it on the second-hand market. ![]() In conclusion, the new TI-Nspire CX sold from now on are completely closed, with no known way to install Ndless or Nlaunch up to date. But managing to make its own older version of the code crash instead of giving you a clear and related error message is not very clean from my point of view - it just looks like a dirty hack - we were used to much cleaner protections so far. Up to date, we do not know exactly what it is So basically, Texas Instruments just invented us a new antidowngrade protection, "Boot2 antidowngrade protection". ![]() So, Texas Instruments did probably change something on the new TI-Nspire CX, something that is managed properly by the new 3.2.4 Boot2 but not the old 3.1 Boot2. But it's obviously still intact, as when flashing back the original 3.2.4 Boot2 the TI-Nspire CX boots successfuly. It's an error that has to do with the file system. The boot2 fails on a non-recoverable error (System Error) and the RS232 console tells us a little more with the "BOOT2 Error: posix_file_init() error". and owners of new TI-Nspire CX could also apply this last solution.in case of omission of this manipulation, it was still possible to reprogram the older Boot2 version using an inexpensive TTL/USB interface (RS232). ![]()
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