1. Uninstall lol before reinstalling it. The installation file of lol is damaged, which will lead to flashback. Need to be reinstalled.
2. Second, do enough memory. Flash back if there is not enough memory. Delete all other useless and redundant programs in the computer, and clean up all junk files, redundant installation packages and browser caches in the computer.
3. Finally, check the firewall and antivirus software to see if it is because the firewall is on or which part is disabled by antivirus software. Close the firewall and exit the antivirus software.
4. After completing all the above operations, start the authentication again.