02-19-2013 01:10 AM
Welcome to BlackBerry Support Forums
Try those steps to downgrade your Device Software :
1.Locate your Carrier and Download the OS5 pack from here BlackBerry Software Download Site
2. Now Double the file that you Downloaded to Install it on your PC
3. Download and install the latest BlackBerry desktop software from here BlackBerry desktop software
4.Search your C: drive for Vendor.xml and delete them, there may be one or two vendor.xml , On your Pc change your folders option to show hidden files/folders ( You can Skip this step if you're using your Carrier OS ) :
5. Go to C:\Program Files\Common Files\Research In Motion\AppLoader. (For 64-bit Vista or Windows 7, the path will be C: > Program Files x86 > Common Files > Research In Motion > AppLoader) double click Loader.exe.
After Installation of New OS restore your backup .