If you do a factory reset you will have to enter in you WU settings again. Should be no trouble even with recent WU changes. You don't need to register a new station ID.... Just log in to WU and get your station credentials. I find it easier to enter these in this after the WS-2000 is on WiFi by using the awnet app instead. You'll have to recalibrate barometer also. Then you'll need to enter in yearly, monthly, weekly etc. rain totals. And any other custizations you may have liked. Of course time zone and lat/lon. Like taking it out of the box.