Exactly! I dont have an Android device so i downloaded bluestacks emulator, installed this patched apk, connected the pc to rc/drone and...the app crashed!
The emulator wasnt able to stream video from the drone but...maybe it emulates/reset in some ways the gps coordinates and sent these info to the drone. Connected back to a fresh DJI GO on IOS and it asking to change my wifi settings for my country, just tap "cancel" and the drone is in FCC mode!
Both drone and rc are at the latest firmware version, ios app version is 4.1.5.
If you have an android device with the modified apk you should be able to change on the fly the country settings to "US" by tapping twice on "controller version" in "about" menu.
Hope this help!