ftp://ftp.ustb.edu.cn

Input steps:

1. service

update

3. Update mode (a new dialog box appears)

customized

Update server

6. Add (a new dialog box appears),

7. Copy the above address into the resource column.

sure

9. (Next dialog box) OK

10. (Next dialog) Apply

1 1. (same dialog box) OK.

12. Update now

As long as you can connect to the domestic network, you can upgrade.