Unlocked 8100 originally on T-Mobile, now with Rogers.
Upgraded OS to 4.5. However, the email was not syncing. Customer support suggested reinstalling OS. Attempted to do so, but I cannot delete applications. When I go to Application Loader it lists only my 3rd party applications but will not allow me to delete them (delete button is dim). When I attempt to delete all applications and reinstall the OS it does not allow me to -- does not even give me the option (the check box is dim). I have downloaded different versions of OS's but none of them are recognized. I have tried a few versions of Desktop Manager but none have worked.
At the moment, for the most part, the bb works -- other than syncing email. But I would rather go back to an older OS in order to have the syncing abilities.