The “Grid UI” functionality is built in the Firmware (2.02.32) and is not available on any other firmwares.
It’s not possible to modify or force older firmwares to have the functionality.
The “trigger” to display the “Grid UI” is found in the meta.xml eg. see below
Older firmware’s ignore this “trigger” as it is not coded into the firmware
?xml version=‘1.0’ encoding=‘UTF-8’?>
<meta version=“0.01” service=“wdtv” ptype=“villa” date=“2010/08/01”/>
<theme id=“0002”>
<title>PM4 WD</title>
<screen_shot title=“home” thumbnail=“http://service.wdc.com/api/thumbnail1.jpg”> http://service.wdc.com/api/screenshot_1.jpg</screen_shot> <screen_shot title=“browse” thumbnail=“http://service.wdc.com/api/thumbnail2.jpg”> http://service.wdc.com/api/screenshot_2.jpg</screen_shot> <author>JoeySymth</author>
<publish_date>2010/08/01</publish_date>
<rating>05</rating>
<downloads>0</downloads>
<description>A PM3 HD port to WDTV</description>
<package_url>http://service.wdc.com/api/default.theme </package_url>
<ui_style>grid</ui_style>
<review>TBD</review>
</theme>
The above code is from my Grid UI Modification Theme “PM4 WD”
http://community.wd.com/t5/WD-TV-Themes/PM4-WD-Project-Mayhem-for-WDTV-Theme/td-p/792197
