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The file you have listed is the file for the DM not the OS for the device. If you download the OS for your device then install it you should be good. You can install a OS that is not for your carrier as long as it is for your device. To do this install it like normal then delete the vendor.xml file you can search for it or go to C:\Program Files\Common Files\Research In Motion\AppLoader the vendor.xml file is located there.