Hey Adarsh123,
Welcome to the BlackBerry® Support Community Forums.
I would suggest reloading BlackBerry® smartphone software, if the BlackBerry® smartphone is rebooting the BlackBerry® Desktop Software may not detect the BlackBerry® smartphone. Please have a look at the following article on how to force the detection of the BlackBerry® smartphone using Application Loader to reload the OS http://btsc.webapps.blackberry.com/btsc/KB10144
If the error message still persists after the reload, further investigation might be required. To help further diagnose the cause, contact your wireless service provider or BlackBerry® Technical Support Services for further review and support.
Thank you.
-HB
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