It sounds like your unit was reset at some point, since the internet settings and Netflix codes were lost. Resetting the device to Netflix isn't typical of a firmware update, but it's not uncommon for a reset to require that you reconnect it to the internet and Netflix.

Try updating the firmware first before going through all the set up process, and you can download the firmware on a thumb-drive or CD from the Samsung Support website to do this, if you'd like.