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Go into the menu and press the blackberry menu key and select "show all" or "unhide"
If not found try to download BBM from the BB world.
Please find the below link to install the BBM on the device by Desktop Software..
If you have Desktop software jus follow from the Step : 3
Try this . .
WEll,, In this case it can be done by Desktop Software. . from there it can see the apps installed and can be re-installed in the device..