Go get some After performing upgrade, the LED flashes red. However, everything corrects itself later. What is the reason of this? It is a normal phenomenon for iOS APP. After the upgrade, the iOS APP will unlock the craft automatically after first connection. After the firmware upgrade, the APP prompts “system error” and the rear LED on the craft is solid red. What can we do? For iOS user, Please connect to the APP and run it as usual. Then the craft will return to normal status. For Android users, Please connect to the APP, start the APP and do a combination of stick command. Then the craft will turn to normal status.