This process will allow you to have 2 versions of the DJIGo4 app installed on your device at the same time. This is helpful if you want to be able to switch between a modded and unmodded app whenever you want without uninstalling/reinstalling frequently. This Howto explains specifically how to have a modded DJIGo4 app installed as well as the latest official DJIGo4 app from the Play Store with the ability to keep the official app updated.
You can then run either app whenever you want. The cloned app will even show up as an option when you connect your remote.
If you only want to run 1 copy but your maps don't work as you have patched it, you can make the maps work by using app cloner, under clone number check the replace original app box and select Google Maps API key option in developer options