Unlike modern smartphones (like iPhone or Android) which update "over the air" (OTA) seamlessly, legacy BlackBerry OS 7 devices required a more manual approach. While standard OS updates could be installed via the BlackBerry Desktop Software, that method was notoriously slow, prone to crashing, and often failed if the device had corrupted files.
The Autoloader will delete everything – contacts, messages, memos, apps, BBM contacts, and media stored on the internal storage (not the microSD card). Remove your microSD card before running the tool to preserve its data. Blackberry Bold 9900 Autoloader