For the 9790, a firmware "change" usually refers to moving from a carrier-branded version (like AT&T or Vodafone) to a "Debranded" or "Vendor-Free" version. The benefits are immediate: Removal of Bloatware:
: If your computer doesn't recognize the phone, ensure you have the latest BlackBerry USB drivers installed. Firmware Change Update on BLACKBERRY 9790 Bold
: Open Loader.exe in that same folder, connect your device, and follow the prompts to "replace applications" with the new firmware. Troubleshooting Tips For the 9790, a firmware "change" usually refers