honestly I don't know the format, it's probably some sort of xml but I don't write it directly.
did it ever work? try to reset the settings (in the menu).
try a previous version or make sure you're using the newest one.
I really have no idea what could cause your problem, it should work on all firmware versions...
Also try to turn your phone completely off, it doesn't do this unless you hold in the power button for about 10 seconds.
btw, I won't reply again for a while, it's 1:30 am here