1, database update: Apple's serial number system needs to be synchronized with the equipment information sold worldwide in real time, which takes 1 to 2 days.

2. Test and verification: During the maintenance period, Apple will conduct a comprehensive test and verification of the system to ensure that the updated system can operate normally and the query results are accurate.

3. Security and privacy protection: Apple updates and optimizes security and privacy protection measures during maintenance, including preventing unauthorized access and data leakage.