The reason why you want to update your friends may be that WeChat has been upgraded, or it may be that WeChat has a problem. Sometimes that's the limit. This always happens before adding friends. There is another problem. There may be an avatar, a screen name, a personalized signature, and sometimes a system update. Sometimes the pass rate is very high in one day, and sometimes none of them pass. This question is very difficult. There are too many people advertising now.