I may be wrong (which is why it would be best to ask in the dedicated thread), but I think that the Firmware selection is what you are choosing to install - ie, while I have the 1.2 UK version, I could in theory select the 1.1 US version.
This would mean you could change your Firmware from 1.4 to 1.2 or 1.1
Again, before doing any of this, I would double check. I only think this due to reading something along those lines when I was looking at the options before the UK version had been released...
Get confirmation before trying anything though!
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