How to obtain default xml files for your DayZ PC server
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The fastest way to restore the server to default values would be a reinstallation, however, reinstalling will wipe all other changes made to the server. If you want to reinstall your server, please check our guide here
In order to obtain the default files for your server you need to access the official Github from Bohemia interactive here:
There you will find all vanilla files for both Chernarus and Livonia.