To .. JSanders,
Really Thanks for your reply
.. Yesterday night at 9pm GMT .. finally i found the problem ..
Actually,
I was connecting the BlackBerry with Generic USB Hub .. which made problem with connection .. Then I fix the cable with USB 2.0 and it works 100% fine
Then I wiped my phone again and installed 4.5 OS .. it's really great, smooth and fanatastic ..
Thanks again to all of you ..
especially :
JSanders & John ..