I can't get my Piaware 3.5 or Dump1090 to update by sending a command

[wiedehopf]

Use a fresh sd-card write a fresh piaware image:
PiAware - build your own ADS-B ground station for integration with FlightAware - FlightAware

Even if you don’t want to use a fresh card, still by far the easiest thing to do.

This might be useful:
For Beginners - How to Get Back Existing Station Number in A Fresh Install