I have an N3DS on 9.0.0 and I would like to update to 9.5.0, making 3DNUS my only option. I have download the 9.5 firmware already, but do I need to update through each version (9.2, 9.3, etc.) or can I just update straight to 9.5?
You can go straight to 9.5. System updates update all out of date components from your previous version to whatever is newest in the update - In your case, 9.5.