You need to uninstall the newer version of the os in the control panel of your pc.
Originally Posted by iamkidd
So I have the beta OS 188.8.131.52 on my BB 8800. I want to downgrade and go back to 184.108.40.206 (official release). I have downloaded and installed Desktop Manager 4.5 and installed the proper OS (220.127.116.11). I have also deleted the vender id file as instructed. When I plug in my BB, I canít figure out how to go install the older OS. Can someone help?