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for those of you who got "invalid model", try add: <Item type="SExtraTitleUpdateMount"> <deviceName>dlc_batman:/</deviceName> <path>update:/dlc_patch/batman/</path> </Item>
to your "extratitleupdatedata.meta" file, the lines on the README.txt is missing the path, that's why you got "invalid model".
for those of you who got "invalid model", try add:
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_batman:/</deviceName>
<path>update:/dlc_patch/batman/</path>
</Item>
to your "extratitleupdatedata.meta" file, the lines on the README.txt is missing the path, that's why you got "invalid model".