I just found something, i dont know how it works but is related with the gameboots and seems to be very important
I opened all the main .xml files from all the rco's of 4.84 firmware in notepad++
Then i did search for the string
<Page name="page_gameboot"
There are 4 different rcoxml files with that same page name:
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custom_render_plugin.rco
<Page name="page_gameboot" have only 1 children named <Plane name="ps3logo"
You know this one.. there are a couple of big pages in wiki with a complete changelog of all official firmware versions
https://www.psdevwiki.com/ps3/Custom_render_plugin
https://www.psdevwiki.com/ps3/XMB_Layouts
game_plugin.rco
<Page name="page_gameboot" have only 1 children named <Plane name="ps3logo_back_color"
game_ext_plugin.rco
<Page name="page_gameboot" have only 1 children named <Plane name="ps3logo_back_color"
gamelib_plugin.rco
<Page name="page_gameboot" have 1 children named <Plane name="ps3logo_back_color"
<Page name="page_gameboot" have 1 children named <Plane name="ps3logo"
*This rco have his own <AnimTree> with an <Animation name="anim_gameboot"> (pretty much the same made by custom_render_plugin.rco)