Thanks, JL_Cmdr did indeed wipe my BB. I then started launched the latest Desktop Software 4.5, clicked the App Loader and then the Update Applications button, but it said "... fatal error can't load something or other". Anyway, I then went to the AppLoader directory and found the Loader.exe, launched it, and now it is in the process of reinstalling OS and apps. My question is, all the posts seem to first instruct people to go through the Desktop Manager after wiping - why not just use Loader.exe? It worked without a hassle on the first try. Also, did I really have to wipe to downgrade? Or could I just have used Loader.exe? Last question, why is it necessarry to delete Vendor.xml?