At present, I do not think anyone has found a way to do this. We in the USA are in the same situation as our carriers do not yet formally support the device, and are not releasing OS updates either. We are all hoping for a similar method as before, but at present it appears that official releases can only be received OTA from your actual carrier, and there is no way to use OS packages from other carriers.
Occam's Razor nearly always applies when troubleshooting technology issues!
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