The reason why the CCB credit card cannot be used for cash installment may be due to the following situations:

1. The status of your credit card may be abnormal, which may cause the cash installment application to be rejected.

2. Check whether the available credit limit on your credit card is insufficient and is less than the applied cash installment amount.

3. If your credit card has had a bad record of overdue repayment, you cannot apply for cash installment.