Extended ROM

[cronos]

I downloaded the Hermes Tweaker and there is this "Extended ROM" hide/unhide thing. What would be the use of that? What can I do with this Extended ROM?

[pof]

Read the wiki, all will become clear after that:
http://wiki.xda-developers.com/index.php?pagename=Hermes_For_Beginners
http://wiki.xda-developers.com/index.php?pagename=Hermes_ExtendedRoms
http://wiki.xda-developers.com/index.php?pagename=Hermes_UpgradeFAQ