With all these Operating System's flying around daily...Sometimes you want to revert back to an older one.
Here are the Steps to Downgrade your Blackberry:
1. Delete the newer OS from your PC by going to Control Panel >Add/Remove Programs.
2. When that's done, simply plug in your device, open Desktop Manager and run Application Loader.
3. Then go to Update Software.
4. From here a series of Yes's will Downgrade the software to the basic version.