Force Stuck Blackberry Loading using Desktop Manager

To force the detection of the BlackBerry smartphone using the application loader tool, complete the following steps:

Warning: The following procedures delete either all data, or all data and applications on the BlackBerry smartphone.

For BlackBerry Desktop Manager 4.5 to 5.0.1:

1. Remove the battery from the back of the BlackBerry smartphone.
2. Connect the BlackBerry smartphone to the computer using a USB cable.
3. In the BlackBerry Desktop Manager, double-click Application Loader.
4. Click Start under the Update Software heading.
5. The Device Password dialog appears. If the BlackBerry smartphone is password enabled, enter the password. If the BlackBerry smartphone does not have a password, leave this field empty.
6. Click OK.
7. If prompted with a list of Available Updates, choose the latest software version by selecting the corresponding check box and then click Next.
8. Click the Settings button under the Device backup and restore options.
9. Make sure that the Back up device data automatically during the installation process check box is not selected.
10. Make sure that the Delete all application data and Erase all currently installed applicationscheck boxes are both selected.
11. Click OK on the Settings dialog.
12. Insert the battery into the back of the BlackBerry smartphone.
13. In the Application Loader wizard, click Next to proceed with the loading process.
14. When the process is complete, the Application Loader wizard displays the following message:The loading operation was successful.
15. Insert the memory card, if applicable.
16. Close the Application Loader wizard.

For BlackBerry Desktop Software 6.0 to 7.0:

1. Remove the battery from the back of the BlackBerry smartphone.
2. Connect the BlackBerry smartphone to the computer using a USB cable.
3. Once prompted to Retry, Update or Cancel, click Update. If available updates are found Desktop Manager will prompt you to Get Update, Update Later or View other versions
4. Click Get Update to install the recommended software version or View other Versions to manually select the version you wish to install and click Install.
5. In the Update Options screen there is the option to enter the email address to be notified in future when there may be new software versions available. 
   1. fill in the checkbox and enter the email address in the text field to receive email notifications
   2. uncheck the checkbox and leave the text field blank to not receive updates.
6. Reinsert the Battery which was removed in step 1
7. Click Install Update
   Note: there may be a prompt to activate the device wirelessly after the upgrade.
   
   
   source :http://supportforums.blackberry.com