I bought the KIT-HGDRONEK66 and I have assembled the drone. I followed the steps and downloaded QGroundControl. Whenever I go to update the firmware I plug in the flight controller it recognizes the flight controller but I get an error saying "Error: Sync: Send Command: Get Command Response: Timeout waiting for bytes to be available." I thought it was because I was on a windows ten but I downloaded it on a windows 8 and 7 and got the same error. I don't know what to do now.