1. If the firmware of the wristband is faulty and the charging is not satisfactory, you can use the Mi Band APP on the mobile phone to connect with the wristband, and upgrade the firmware of the Wristband on the APP side after connection to solve the problem.
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2. It may also be that the internal circuit, battery and circuit board of the wristband are faulty, and it is necessary to contact Xiaomi's after-sales service for repair or replacement.