following on from interesting threads by chriscooke109
i've been toying with attempting to load upgrades and switching the ms.
as chris has already mentioned in past posts if you hit standby just after the flash screen when you upgrade, then swap the ms for a lower firmware version ( I'm on 2.01 and have been swapping for 2.00) you can bypass the first firmware version check but then you still have the problem of the check after you've swapped them and pressed x or O to confirm the update.
I've also been playing around with a hex editor and changing various numbers in a 2.00 eboot and trying the same thing again.
This time what was interesting was that the wallpaper theme I saw when being told the (no longer signed) eboot could not be started was red as opposed to my default blue.
Has something happened here to default back to the original settings?
anyways, just wanted to pass on this info in the vain hope that it could be useful to someone.