...
Please read this manual for a walkthrough of connecting your Here+ RTK to your Drone through QGroundControl -
Using Here+ RTK With QGroundControlWispr Ground Control
Can I fly in Altitude Hold mode?
...
Confirm you followed all steps correctly in the manual: How to Update WisprGroundControl Updating Wispr Ground Control .
Check that you are installing from the extracted file and not the zipped folder
...
If you try to load the Custom Flight Firmware onto the drone and everything is hooked up correctly. and you get the error message of “cannot read board”, you should check in the top right and make sure the COM port is set to Auto. If it is set to anything else you will not be able to load the Custom Flight Firmware and will get an error message. Change to Auto on the COM port and follow the steps.
...
How do I use the Offline Maps feature and what is it good for?
Offline maps are good to create if you are going to be flying at a later time in a spot without WiFi access but still need the maps while flying. Here is a guide on how to use them and how to put them on your smart controller : Downloading Maps While Offline