1. Network connection reason: If the network connection of the brush machine is unstable or interrupted, an "X" will be displayed in the upper right corner. At this time, you need to check whether the network connection is normal and reconnect the network.

2. Recognition failure: If the face brush machine cannot recognize the user's facial features, an "×" symbol may be displayed in the upper right corner. This is caused by the user's face being blocked, insufficient light or other factors. You can re-enter face information to ensure that the entered face information is clear and complete, and keep the face facing the face brushing machine when entering.