V 2.0 adds the following functions based on V 1.0: 1. Multi-route upgrade server selection; 2. The time interval between virus database updates and the officialæ£ç‰ˆ user synchronization is not large; 3. Add the self-upgrade function of the upgrade baby program; 4. Add the automatic addition of ID-free upgrade server function, users who care about synchronization time can try to use private server upgrades; 5. The code has been optimized, reducing resource usage for users.