1. It may be that the dial and the charging slot are not inserted tightly, which is the most common reason for no reaction to charging;
2. The metal charging connector of the dial is oxidized, resulting in no charging;
3. Gently scrape the metal connector with a small blade, and then try to charge it.
4. You can try to clean up the charging contact on the back of the watch, and then press the watch on the charging seat, and then charge to observe whether the charging is successful. If it is still unable to charge and use, it is recommended that you contact the Xiaomi after-sales service hotline for help.