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/usr/share/dbus-1/interfaces/org.freedesktop.ModemManager1.Modem.Firmware.xml is in modemmanager-dev 1.6.8-2ubuntu1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8" ?>

<!--
 ModemManager 1.0 Interface Specification

   Copyright (C) 2011-2013 Red Hat, Inc.
   Copyright (C) 2011-2013 Google, Inc.
   Copyright (C) 2011-2013 Lanedo GmbH
-->

<node name="/" xmlns:doc="http://www.freedesktop.org/dbus/1.0/doc.dtd">

  <!--
      org.freedesktop.ModemManager1.Modem.Firmware:
      @short_description: The ModemManager Firmware interface.

      This interface allows clients to select or install firmware images on
      modems.

      Firmware slots and firmware images are identified by arbitrary opaque
      strings.

      Firmware images are represented as dictionaries of properties.
      Certain properties are pre-defined, and some are required:

      <variablelist>
        <varlistentry><term><literal>"image-type"</literal></term>
          <listitem>
            (Required) Type of the firmware image, given as a
            <link linkend="MMFirmwareImageType">MMFirmwareImageType</link> value
            (signature <literal>"u"</literal>). Firmware images of type
            <link linkend="MM-FIRMWARE-IMAGE-TYPE-GENERIC:CAPS">MM_FIRMWARE_IMAGE_TYPE_GENERIC</link>
            will only expose only the mandatory properties.
          </listitem>
        </varlistentry>
        <varlistentry><term><literal>"unique-id"</literal></term>
          <listitem>
            (Required) A user-readable unique ID for the firmware image, given as a
            string value (signature <literal>"s"</literal>).
          </listitem>
        </varlistentry>
        <varlistentry><term><literal>"gobi-pri-version"</literal></term>
          <listitem>
            (Optional) The version of the PRI firmware image, in images of type
            <link linkend="MM-FIRMWARE-IMAGE-TYPE-GOBI:CAPS">MM_FIRMWARE_IMAGE_TYPE_GOBI</link>,
            given as a string value (signature <literal>"s"</literal>).
          </listitem>
        </varlistentry>
        <varlistentry><term><literal>"gobi-pri-info"</literal></term>
          <listitem>
            (Optional) Additional information of the PRI image, in images of type
            <link linkend="MM-FIRMWARE-IMAGE-TYPE-GOBI:CAPS">MM_FIRMWARE_IMAGE_TYPE_GOBI</link>,
            given as a string value (signature <literal>"s"</literal>).
          </listitem>
        </varlistentry>
        <varlistentry><term><literal>"gobi-boot-version"</literal></term>
          <listitem>
            (Optional) The boot version of the PRI firmware image, in images of type
            <link linkend="MM-FIRMWARE-IMAGE-TYPE-GOBI:CAPS">MM_FIRMWARE_IMAGE_TYPE_GOBI</link>,
            given as a string value (signature <literal>"s"</literal>).
          </listitem>
        </varlistentry>
        <varlistentry><term><literal>"gobi-pri-unique-id"</literal></term>
          <listitem>
            (Optional) The unique ID of the PRI firmware image, in images of type
            <link linkend="MM-FIRMWARE-IMAGE-TYPE-GOBI:CAPS">MM_FIRMWARE_IMAGE_TYPE_GOBI</link>,
            given as a string value (signature <literal>"s"</literal>).
          </listitem>
        </varlistentry>
        <varlistentry><term><literal>"gobi-modem-unique-id"</literal></term>
          <listitem>
            (Optional) The unique ID of the Modem firmware image, in images of type
            <link linkend="MM-FIRMWARE-IMAGE-TYPE-GOBI:CAPS">MM_FIRMWARE_IMAGE_TYPE_GOBI</link>,
            given as a string value (signature <literal>"s"</literal>).
          </listitem>
        </varlistentry>
      </variablelist>
  -->
  <interface name="org.freedesktop.ModemManager1.Modem.Firmware">

    <!--
        List:
        @selected: The unique name of the selected firmware image, or the empty string if no image is selected.
        @installed: An array of dictionaries containing the properties of the installed firmware images.

        List installed firmware images.

        Depending on the type of modem, installed images may be stored on the
        host or the modem.

        Installed images can be selected non-destructively.
    -->
    <method name="List">
      <arg name="selected"  type="s"        direction="out" />
      <arg name="installed" type="aa{sv}" direction="out" />
    </method>

    <!--
        Select:
        @uniqueid: The unique ID of the firmware image to select.

        Selects a different firmware image to use, and immediately resets the
        modem so that it begins using the new firmware image.

        The method will fail if the identifier does not match any of the names
        returned by
        <link linkend="gdbus-method-org-freedesktop-ModemManager1-Modem-Firmware.List">List()</link>,
        or if the image could not be selected for some reason.
    -->
    <method name="Select">
      <arg name="uniqueid" type="s" direction="in" />
    </method>

    <!--
        Install:
        @image: The identifier of the firmware image to install.
        @slot: The identifier of the slot into which the firmware should be installed.

        Install an available firmware image into a slot.

        It does not guarantee that the image will be installed into the
        specified slot, but does guarantee that, if the slot is empty, no
        image will be overwritten, and if the slot is not empty, no image
        other than the one in that slot will be overwritten.

        The method will fail if either of the identifiers is invalid, or if the
        image could not be installed into the slot for some reason.

    <method name="Install">
      <arg name="image" type="s" direction="in" />
      <arg name="slot"  type="s" direction="in" />
    </method-->

  </interface>
</node>