Importing Data

I just got the forerunner 255 and have successfully imported all my data from my Fitbit except for the day I got my Garmin (yesterday). I got it in the evening and put it on. It logged 1,000 steps and will not let me import data for this day. Any idea how I can import data for this day or how I can erase all the data for the day so I can import data? Any suggestions would be helpful!