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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!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.