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        extension must be upgraded, and some other services must be upgraded.
    </p>
    
    <p>
        There is no automated upgrade system for extensions; if an extension
        must be upgraded, you must do it manually. If the extension has any
        python code, this will mean replacing any v2-compatible code with
        v3-compatible code. In some cases parts of the configuration file
        <span class='code'>weewx.conf</span> must be modified.
    </p>
    
    <p>
        For example, to 