Well after a doing a little bit of searching, it seems like I've found the way to do it. Forgive me if the instructions are a bit redundant: I didn't write them. I'm going to try this now.
Here are the steps for use with a hybrid:
Plug your BlackBerry into your MacBook with BlackBerry Desktop Manager Running.
Install the carrier recommended OS (in this case AT&T OS 126.96.36.199)
Reload the OS that the carrier recommended for the phone. This will download all the appropriate files that are required.
Have the hybrid OS handy (in this case 8330 OS 188.8.131.52)
Go to Hard Drive > Username > Library > Application Support > BlackBerry Desktop Manager > Device Applications > Folder with numbers and letters
Open the Java file containing the hybrid OS files
Select all the files in the hybrid OS folder
Drag and drop these files into the folder with numbers and letters found in step 5
When prompted to replace files, click on apply to all and then replace
Go to BlackBerry Desktop Manager (should be running in background) and click on Applications and click Check for Updates
It will say there are no new updates in the next screen. Click on Show Other Versions in this screen.
You will now find the carrier recommended OS that was installed in steps 2 and 3. Click on the radio button to the left so it is “selected” and then click on Select.
Click on Reload
The Desktop Manager for Mac will think it’s just reloading the current OS to the BlackBerry but since you copied over the files from the hybrid OS it will actually be loading a different OS. As always please make backups before attempting to install or upgrade anything.
Last edited by tonyishood; 11-11-2009 at 12:59 PM.