Copyright issues. According to Weibo, the official developer of the app, the app was completely downloaded due to copyright issues, and it can be restored after the copyright is restored, and will continue to be put on the shelves. The official version of the Cascade Navigation Mobile Phone Interconnection app can be replaced by Easy Link Driving Assistant, which can realize the functions of Cascade Navigation Mobile Phone Interconnection, Intelligent Car Screen Projection, Real-time Navigation Control, High-tech Navigation and Safe Driving, Car Navigation and so on. Fully functional, compatible with most domestic models.