Try changing your USB cable as some cables do not support transferring data. If that does not solve your problem, contact us at support@blues.com and we will get you set up with another tool to communicate with the Notecard.
The help command gives more info.
help
Don't have an account? Sign up
Learn how to get started with Cellular, Satellite, LoRa, and WiFi using Blues Notecard on April 17th