$(document).on('ready pjax:scriptcomplete',function(){
 
  $('link[rel="shortcut icon"]').attr('href', '/upload/admintheme/YourThemeName/favicon.ico');
  $('link[rel="icon"]').attr('href', '/upload/admintheme/YourThemeName/favicon.ico');
});

<?xml version="1.0" encoding="UTF-8"?>
<!--
    Bay of Many configuration for the admin styles.
    In future versions of LimeSurvey, it will be used to fill a admin_style table,
    and to give user control on template configuration (like variables to use to render the questions, banners, background, etc.)
-->
 
        <js>
            <filename>notify.js</filename>
            <filename>save.js</filename>
            <filename>panelclickable.js</filename>
            <filename>panelsanimation.js</filename>
            <filename>sidemenu.js</filename>
            <filename>bootstrap-switch.min.js</filename>
            <filename>jquery.jcarousel.min.js</filename>
            <filename>jcarousel.responsive.js</filename>
            <filename>custom.js</filename>
        </js>
 
<config>

<?xml version="1.0" encoding="UTF-8"?>
<!--
    Black Pearl configuration for the admin styles.
    In future versions of LimeSurvey, it will be used to fill a admin_style table,
    and to give user control on template configuration (like variables to use to render the questions, banners, background, etc.)
-->
<config>
    <metadata>
        <name>Black Pearl Custom</name>
        <creationDate>20/02/2020</creationDate>
        <author>Author Name</author>
        <authorEmail>example@example.com</authorEmail>
        <authorUrl>https://example.com</authorUrl>
        <license>GNU General Public License version 2 or later</license>
        <version>3.0</version>
        <description>A customization of Black Pearl</description>
        <basecolor>#071630</basecolor>
        <last_update>2020-02-20 17:00:00</last_update>
    </metadata>
 
    <!--
        Here the list of the css/js files to load.
        Any file here will be loaded via the asset manager
    -->
    <files>
        <css>
            <filename>lime-admin-colors.css</filename>
            <filename>statistics.css</filename>
      <filename>custom.css</filename>
        </css>
 
        <js>
           <filename>custom.js</filename>
    </js>
 
        <!--
            Those files will be loaded for right to left languages only
            NOTE 1: If for any reason, you need to edit the RTL behaviors, feel free to contact the LimeSurvey team about it.
            We'll be always pleased to make better the right to left display
 
            NOTE 2: those files are generated with the script R2. See: https://github.com/ded/R2
        -->
        <rtl>
            <css>
                <!-- Still need these files -->
                <filename>lime-admin-colors.css</filename>
                <filename>statistics-rtl.css</filename>
            </css>
            <js></js>
        </rtl>
    </files>
 
    <engine>
        <!-- If you want to use asset manager, even in debug mode, set this field to true. -->
        <use_asset_manager_in_debug_mode>false</use_asset_manager_in_debug_mode>
    </engine>
</config>