I notice you’ve mentioned “ndless 5.4.0.259” — that looks like a specific version number for Ndless, the custom firmware/development environment for TI-Nspire calculators.

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Ndless 5.4.0.259 -

I notice you’ve mentioned “ndless 5.4.0.259” — that looks like a specific version number for Ndless, the custom firmware/development environment for TI-Nspire calculators.