Using an autoloader is the most effective way to unbrick or factory reset a BlackBerry Bold 9780
Clean Start: It completely wipes the device, removing all old data and potential software glitches. How to Use a BlackBerry 9780 Autoloader blackberry 9780 autoloader
If you're looking for more help with your 9780, let me know: Are you getting a specific error code (like 507 or 513)? Using an autoloader is the most effective way
For non-autoloader manual installs, users famously had to delete the Vendor.xml blackberry 9780 autoloader
or standalone drivers so your PC can recognize the device in its "bootloader" state. Step-by-Step: Using the Autoloader
BlackBerry 6.0.0.723 (East Asia) – "The Speed Demon"