...
Confirm you followed all steps correctly in the manual: Updating Wispr Ground Control
Ensure that you are installing from the extracted file and not the zipped folder.
To extract the files from the zipped folder, right click and select “Extract All”
Enable "Developer Mode" on the smart controller by navigating to Settings → About Phone → Build Number and tap at least 7 times on Build Number. You will receive a message stating “You are now a developer”. Once you finish this step you need to enable USB debugging in the settings.
Go into settings and scroll down to Developer Options. Once there, you will see USB debugging with a toggle switch to the right of it. Toggle the switch on. You may now run the update tool again.
The smart controller may prompt the user with a message reading “Allow USB debugging on this computer?” if it is the first time updating from that computer. Press yes to proceed. You will only need to allow USB debugging one time on each device.
While trying to update Wispr Flight Firmware in Mission Planner, a pop-up reading “Is this a Solo” appears. What should I do?
Do not be alarmed by this message. Select “No” and the custom firmware will begin to load.
Updating WisprGroundControl and Wispr Flight Firmware
...