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    10 <!DOCTYPE concept

    11   PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

    12 <concept id="GUID-9DCD2076-0F73-5BB7-85BF-580567E0AB53" xml:lang="en"><title>Package Upgrades</title><prolog><metadata><keywords/></metadata></prolog><conbody>

    13 <p>Package Upgrade is the replacement of a package with its newer version

    14 to enhance functionalities or fix software defects.</p>

    15 <p>Package upgrades are based on the following two scenarios:</p>

    16 <ul>

    17 <li id="GUID-8A64D17D-9C9B-55E7-9744-027139BF992E"><p>Packages that are installed

    18 on the data drive or the RAM drive can be upgraded directly by installing

    19 a SIS file of type <codeph>SA</codeph>, <codeph>SP</codeph> or <codeph>PU</codeph>.</p> </li>

    20 <li id="GUID-D334752D-12BF-56A4-B7F1-5C8C01E3B030"><p> Packages that are installed

    21 on the ROM drive can be upgraded only by means of <xref href="GUID-F8A26275-883A-5299-9C37-9DDCC2F62108.dita">eclipsing</xref>.

    22 For details on how to upgrade package files on ROM, see <xref href="GUID-7F65B69A-6AC1-509C-91E8-9E49ED0BFEC0.dita">Upgrading

    23 OS Components</xref>.</p> </li>

    24 </ul>

    25 <p>Orphan files that are not installed by an installation package can be overwritten

    26 only if the device creator has enabled the corresponding option (<codeph>AllowOrphanedOverwrite</codeph>)

    27 in the installation policy file. </p>

    28 <p>For information, see <xref href="GUID-F8C2E97C-35EC-5437-BC6B-E2A622D2DC4D.dita">Secure Software Install Reference</xref>.</p>

    29 <p>The following sections provide details

    30 on upgrade types and how these types are used in system upgrade and preinstalled

    31 package upgrades:</p>

    32 </conbody></concept>