Why can't the Royal Sky Devil's Gift Code be activated?

Recently, some players have reported that the gift code cannot be activated in "The Royal Devil", how to solve it? Don't be impatient, the following system Daquan Xiaobian will bring you the skills and tips of high play sharing, I hope to help everyone.
1. Exit the game and log in again. 2. Use the gift code to activate the costume immediately after logging in. 3. Don't quit using the gift code in the system menu during the game. This will result in the inability to activate. 4. Enter the game. After the animation, go to the main menu. . 5. Operation "WS" or "“↑↓” keys (use the left joystick to control the up and down handles), move the cursor to “use the package code”, press enter (handle is START/A Key) 6. Enter the received gift code and press Enter again (support copy/paste function)