Tips & Tricks Blackberry 9: How do I upgrade & downgrade the OS on my Blackberry?
Posted by freeappsblackberry on December 11, 2009
How do I upgrade & downgrade the OS on my Blackberry?
1.Download and install the latest version of Desktop Manager.
2.Download the new OS you want and put it to the pc.
3.Open Desktop Manager and do a complete back up of your current device.
4.Delete the vendor.xml file located in c:\program files\research in motion\apploader
5.Plug in Blackberry and open Desktop Manager.
6.Select Application Loader.
7.You’ll be prompted to upgrade.
How do I downgrade the OS on my Blackberry?
1.Delete the newer OS from your PC by going to Control Panel>Add/Remove Programs.
2.Then download an install the old version of the os.
3.Locate and delete the file named “vendor.xml”
4.When that’s done, simply plug in your device , open Desktop Manager and run Application Loader. The loader will downgrade the OS.