Since BlackBerry legacy services have been largely decommissioned, finding official links can be difficult. You generally have two sources:
C:\Program Files (x86)\Common Files\Research In Motion\AppLoader . blackberry 9800 autoloader link
Users typically turn to autoloaders for "leaked" OS versions or to resolve "error 507" (missing OS) issues. However, it is an all-or-nothing process—it will completely erase all data on the phone. Accessibility: blackberry 9800 autoloader link
or archives, as official download servers are largely offline. CrackBerry BlackBerry Torch 9800 Hardware Review blackberry 9800 autoloader link