"To remedy this, copy the file "/System/Library/Fonts/Helvetica.otf" to the same location on your ATV."
What location? You din't define which volume you mean here. frontrow? osboot? Since the "frontrow" volume doesn't have a system folder and "osboot"'s system folder is read only, I am a bit confused... Also, I didn't have the .otf font but the .dfont only in my system so I cannot find the specified file. Please, provide further explanations here!
You can use the .dfont. You have to copy it to the exact same path, after mounting the system disk read/write. --Tego 21:26, 21 November 2007 (CET)