This guide helps you to determine and solve problems encountered when installing Ndless v3.1.

It has not been updated yet for Ndless v3.6, but you may post a comment to ask for help.

I can’t downgrade from OS 3.2.4 to OS 3.1

OS 3.1 is required for Ndless v3.1 to work. Unfortunately OS 3.2.4 includes an anti-downgrade protection, and makes Ndless v3.1 impossible to install on some newly bought calculators. You must update to OS 3.6 and use the latest Ndless v3.6.

Student Software displays the error message “the handheld is not responding”

Don’t worry, this message will always appear at the end of the installation. The popup on the calculator side should confirm the success of the installation. No more steps are required and you can start using native programs. Close and reopen Student Software if you want to be able to continue to use it. If the error message still appears, try to reboot the computer.

Student Software displays the error message “The operating system file is corrupted or invalid. Please go to education.ti.com to get a new OS file.”

You are probably trying to install Ndless v3.1 on OS v3.2 or higher. Ndless v3.1 is not compatible with these versions. You must update to OS 3.6 and use the latest Ndless v3.6.

The TI-Nspire reboots when transferring ndless_installer-3.1.o.xxx

Make sure:

  • OS v3.1.0.392 is installed on the calculator. You can check this in the Settings -> Status of the TI-Nspire. If not, upgrade the OS before installation.
  • You are using the TI-Nspire Student Software, Teacher Software or  TI-Nspire Computer Link Software v3.2 or higher to send the installer. Previous versions of Computer Link Software are not supported.
  • You are using the latest version of Ndless, i.e. the one with the greatest revision number
  • You have copied ndless_resources.tns  in a top-level directory of the TI-Nspire called ndless (mind the case). The file must be transfered just under ndless, and not to a subdirectory.

ndless_installer-3.1.o.xxx is rejected when transferred

Make sure you are using the TI-Nspire Student Software to send the file ndless_installer-3.1.o.xxx.

If you are getting the error “Wrong handheld type for the OS being sent”, check that you are using the good ndless_installer-3.1.o.xxx  for you device type:

  • .tno: classic TI-Nspire
  • .tnc: classic TI-Nspire CAS
  • .tco: TI-Nspire CX/CX-M
  • .tcc: TI-Nspire CX CAS/CX-M CAS
  • .tmo: TI-Nspire CM-C
  • .tmc: TI-Nspire CM-C CAS

The Student/Teacher Software displays during the installation  the error “experienced a problem while communicating with the handheld. a retry may be successful.”

This error is expected. Make sure the installation confirmation is displayed on the device. Close the Student/Teacher Software and reopen it to be able to continue transfering files.

The TI-Nspire hangs at reboot time

If the TI-Nspire hangs at reboot time on this screen:

This can happen for example when a program not compatible with TI-Nspire CX is run on a CX.

To be able to boot again, you need to either:

  1. Unplug and replug the battery. This can be quite difficult to do on TI-Nspire CX, see this thread for some advice.
  2. On TI-Nspire CX, press the Reset button, and:
    • Hold the the following keys at boot time: Esc+Menu+Minus
    • This brings the diagnostics menu. Choose the option to run NAND tests.
    • Exit the diags tool. The OS should now correctly boot .

The TI-Nspire falls into a reboot loop

  1. Reboot the TI-Nspire, by unplugging the USB cable, then removing and putting back a battery on classic TI-Nspire or by pressing the reset button on TI-Nspire CX.
  2. Enter the maintenance menu by turning it on while holding the following keys until half the progress bar:
    • with the ClickPad keypad: Home+Enter+P then ON
    • with the TouchPad keypad or the CX: Doc+Enter+EE then ON
  3. If the maintenance menu displays the message “Replace the battery and try again“, see below “The TI-Nspire CX falls into a reboot loop and ran out of battery”.
  4. Select ‘2’ to uninstall the current OS. Reinstall it when asked to.

Next time make sure to never delete the file ndless_resources.tns as long as Ndless is installed. To uninstall Ndless,  ndless_resources.tns  should be opened first from the Documents screen, then deleted.

If the device still fails to boot, try to unplug and replug the battery (see The TI-Nspire hangs at reboot time above for hints with the CX).

The TI-Nspire CX falls into a reboot loop and ran out of battery

You then can’t open the maintenance menu as suggested above.

Press the Reset button, and:

  • Hold the the following keys at boot time: Esc+Menu+Minus
  • This brings the diagnostics menu. Choose the option to run the battery tests.
  • Plug the TI-Nspire to a computer
  • Wait for the battery to reach a level of 30%
  • Exit the diags tool by pressing the Reset button at the back of the calculator (there’s not exit option in the menus)
  • Now try to open the maintenance menu and follow the procedure above (“The TI-Nspire CX falls into a reboot loop”).

(Credits to TI-Planet.org for this procedure)

Running an executable from the documents screen displays “Sorry. Could not open document ‘xxx.tns'”

Ndless has not been correctly installed. Try to reinstall it.