We're glad to announce that Patch 6091 will be released, following the routine server maintenance on June 13, 2015.
Note: You must be sure that the client is completely closed before patching, otherwise the patch may not be installed correctly and you won’t be able to login the game.
Highlights of Patch 6091
Anti-bot System Update
The anti-bot system is updated to the latest version to deal with current illegal client revising.