actually i've just been using the xenium 2.3.0 OS to change the eeprom settings, trying all sorts of combinations of PAL/NTSC (can display both), the dvd regions, and the game regions. I keep a backup of the eeprom so i know what it originally was set on, but none the less it doesn't work.
Also i read the XYZ codes thread, and it mentions 00A8-4860 as being common among banned eeproms, and i've been banned plenty of times, it is always the common Y code.
i'm probably gonna end up buying a broken xbox on ebay and swapping parts with an xbox i have in my basement.