Hello! Grand Chase Mobile (GrandChase PH) just out today and many people experience problems which include - not compatible with device and update now.
In order to fix them on Android follow this 2 steps -
1. Download Grand Chase APK from APKpure.
2. After installing game in black 'update screen' refuse (press 'Next Time') to download update. After that you will be back to game and need to patch it, agree.
Grand Chase Gameplay