I tried to perform a backup & restore using the info of other BB 8100 that I have, and the keypad still not working. Then I downloaded the last BB Op. Sys. and installed in the BB, start-up & boot again... and the keypad still not working.
Probably the problem is with the keypad hardware... a loosing cable or connection, I don't know. This morning when I check the phone, the display shows this: "Wqeqeqeqeqeqe..."
Itís very strange!!!