The icon hack was discovered by 'kgsws', they're 64x64x8 bitmap images with the first pixel set as transparent. They're stored as MIG files, as far as I can tell. The XMB snips 4 pixels off from the width, effectively making the images display as 60x64x8.
They're stored in a weird way in the topmenu_plugin.rco file.

The version number '3.02 OE-B' isn't the real version. The actual version is still 3.02, which is why games detect that and run normally, but the systemctrl.prx file attacks while the system information screen loads, forcing it to display as OE-B. You can exploit this by over-writing the 9 characters following decimal address 42108 in the PRX. The characters are seperated with a '00' and spaces are made known with '20' characters. A maximum of 9 characters can be used; if more are used, random 'E's and 'a's tend to pop up. If the hack is less characters they can just be filled with spaces.

The online manual uses a URL stored in a HTML plugin in Flash0, so you can simply input a URL up to 52 characters, replacing the original. Any extra characters can be hex'd out.

The font simply replaces the ltn0 file in Flash0:\font, and the background is just a PNG image set by the XMB.

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