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TI-nspire CX OS missing

Hello

I recently went to start my device a couple of days ago for a class, when the load screen prompted it stopped loading and came up with the error message "Operating system not found. Install OS now." My device came with the CD to load a program for my computer, but not a OS for my calculator. I need this for school and the retailer I bought this from is no help. Does anyone have a solution to my problem?

Thanks