If you want to be able to access the game without encountering server maintenance errors, you must delete all game data, then turn on VPN where it is supported (for example, in Asia, use singarpo VPN). After turning on vpn, you go back to the game and waits for the game to finish downloading data before playing. After you have completed the above steps, you can turn off vpn and play normally.
Note: it is required to delete all game data then turn on vpn and then enter the game, the most