If you are looking for TV firmware, don't just search the model name. Open the back of the device and look for the Main Board Number (e.g., TP.MS338.PB801). Searching for this number + "firmware" is much more reliable than searching "Technostar Rio."
Once you find the file, you'll need to prepare it for the device: Download TECHNOSTAR RIO SMART rar
What are you trying to fix (e.g., stuck on logo, black screen)? If you are looking for TV firmware, don't
Plug the power back in while holding the button until the "Software Updating" screen appears. To give you more specific help, could you tell me: stuck on logo
Do you have the from the internal hardware?