[John Clark]

On your PC go to C:\Program Files\Common Files\Research in Motion\Shared\

Find the OS version you want to copy the theme out of. In my case I went to C:\Program Files\Common Files\Research in Motion\Shared\9700M_v5.0.0.442_P5.1.0.121\Java and copied the following file:

net_rim_theme_tmobile_zen_480x360_b_03.cod

Then I pasted it into C:\Program Files\Common Files\Research in Motion\Shared\9700M_v5.0.0.536_P5.1.0.138\Java (I did go in here first and make a copy of the original and stored it in a folder so that I could easily restore it again if I wanted to. If you don't do this then the only way to restore it is to reinstall the OS to the PC again--not a big deal, though.)

Then after you do that, simply connect the BB and run Loader.exe again. It should show "downgrade" under Core Applications (this is because the theme has the same version as the OS) but leave everything else the same. Hit "Next" and finish the loader process. It should reboot when it's done and you'll have the old theme.