BlackBerry OS updates were not delivered uniformly. Carriers (Verizon, AT&T, Vodafone, etc.) had to approve and "sign off" on OS releases. To prevent users from installing an OS meant for a different carrier, the Desktop Software checked a file called vendor.xml .
Open Loader.exe (typically found in C:\Program Files (x86)\Common Files\Research In Motion\AppLoader ). application loader wizard blackberry download exclusive