Well that's good news (sort of) for you, actually, since it sounds like you either haven't downloaded the proper files, or you aren't invoking the command in the same directory, or you haven't renamed the downloaded files the same as in the instructions. You may want to work through the Flashing Guide step-by-step, ensuring that you understand what you're doing in each step. You may want to locate some help locally to help with downloading, locating and renaming files before proceeding, since those are crucial prerequisites to the flashing procedure.