USB not detected by "Dell Backup and Recovery" application.

Hi,

                         I have Dell Inspiron 15R (5520), I need to create a factory backup using Dell Backup and Recovery application, but the USB( Transcend 16GB )  inserted is not detected by the application, instead the clock in the application just runs and runs. 

                         Please donot tell me to use another USB or with DVDs and to update application as I have unlimited internet service and my PC is up to date. I have tried with many USB's and got the same problem. Give me a solution to create a factory backup using the USB that I mentioned above which is latest.

                        Please give me a solution if Dell really cares its customers.