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How to update the certificate of badminton second-level referee?
Re-attend the training and take the exam.

1. Retraining: To update the expired badminton second-level referee certificate, you need to attend the training again and obtain the corresponding training certificate.

2. Take the exam: After obtaining the training certificate, you need to take the corresponding exam. After passing the exam, you can get a new badminton second-level referee certificate.