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BlackBerry® OS Smartphones

New Member
Posts: 1
Registered: ‎02-18-2013
My Device: curve 9300
My Carrier: mobinil

Downgrade from os6 to os5


Please I have so 6 on my BB curve 9300, And I need to remove it completely an reinstall the os5, how I can do this ?

And I downloaded the software Ana they didn't work 

Elite II
Posts: 7,974
Registered: ‎06-01-2012
My Device: Curve
My Carrier: BSNL

Re: Downgrade from os6 to os5

Hello mahmoudghazy


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

  • (make sure you are downloading for the same model as you have )

 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

  • Then using desktop software perform your full backup of your device.

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 ) :

  • C:\Program Files (x86)\Common Files\Research In Motion\AppLoader
  • C:\Users\Windows UserName\AppData\Roaming\Research In Motion\BlackBerry\Loader XML


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 .


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