Sounds like he wanted you to do a firmware update.
The files are at http://www.ebooktechnologies.com/migration.htm
I've done mine (the REB1200) and know of at least 2 other people that have also migrated their readers without too much trouble.
You don't really need to migrate unless you are at the firmware level that won't let you directly load personal content to the reader. I don't remember what version that is but think it's somewhere around 3. The current is 4.22 something or other.
The eBookwise Librarian will let you send ebooks directly to a card in a reader and will put them in the right place on the card even if the reader is not registered.