Yes, that is what I mean. And I have googled it but I get so many I wondered if one sort of stood out as "TFTP for dummies". I only need to do this once with one switch, a simple firmware update, and sort of don't want to end up using a sledgehammer to pound in a finishing nail if you take my meaning.
I see your problem, and you are on the right path... but we have been too far away from it too long to be helpful... There are a lot of helpful people on those sites, though, if you contact them with very, very specific descriptions of what you are trying to do.