What is your preferred method? DO you use a tool, calibration pattern, etc...?

Same happened with me regarding my purchasing of GPS GARMIN VIAGO app on Google play. I still can download the app from my library, but after installed, it tries to reach the license server and fails everytime, rendering the app useless. And i forked 40 USD into this...(bought the maps from almost all the globe) hell..…

I tried to use this method, but keep getting