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Try a factory settings reset. (That option is usually at the bottom of the Setup menu in the camera's Settings menus and tabs.)
If that doesn't work, tell me:
Has the camera ever been able to download RAW ? how about JPEG, has that ever worked? or, is JPEG still working, but not RAW ? please clarify that aspect of the problem your camera is having.
How old is the camera? in months or years since you bought it.
Has the camera been dropped or otherwise subjected to mechanical shock(s) in its lifetime?
Has the camera been operated in or subjected to, temperatures below 32 degrees F (freezing point) or above about 100 degrees F ?
Has it ever been subjected to a humidity higher than 85 % or gotten wet ?
Has the camera been operated in a gritty or sandy environment, such as a beach, a seaside, a construction site, or the like?