What does the Self-Test ([mode]+[alpha]+[ln]) show, on the versions screen, towards the top right? (You can take a pic if you can't screenshot it, I forgot if it's doable there)
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Inspired-Lua.org: All about TI-Nspire Lua programming (tutorials, wiki/docs...)
Isn't 1.21 the default placeholder Python firmware flashed in factory ? It should get updated to a fully working Python firmware on the first opening of the Python app, which apparently wasn't the case...