I installed the UK MK7 update weeks ago and want to switch back to the US now that it's available to get Exchange previews back. What's the CSC code for the US? Kies won't update since it says I already have MK7. Is there another place to download the new ROM? Can I downgrade to an older US ROM and let Kies update that way? I would, but I can't find even the old US ROMs.