i think your case is unique. heres my thinking behind this.
your problem was caused by trying to change the text on the xmb right? well i think that even if they find an exploit it will not be of any use to you. the reason is that to save/load you are dropped back partially to the xmb which performs the save/load. now if you can save/load without problem then an exploit will help you. if thats the case then the damage done to the xmb is confined and any game exploits through save/load will work.
people have been looking for exploits in games since day 1, thats why the only one that exists is gta. it isnt just because its the best game its because it was badly coded. now thats not to say there isnt other possible exploits, im sure there is, but finding one and then being able to use it will take time. your fastest and best hope is a new motherboard or the modchip.
sorry to be the dampener but i think your out of luck unless someone finds an obvious hole in a game and manages to exploit it.
now just a thing to try - what happens when you hold the down key while starting the xmb without a disk in the drive? if you hear the click sounds there may be a way to get to the update. if you dont then nothing ventured nothing gained.
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