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Upgrading IOS on Nexus 5K using tftp server

While attempting to upgrade the IOS on the Nexus 5k I was experiencing issues with the "name of the TFTP server" question being asked by the device. Normally, upon using the TFTP opposed to other tools I had very little problems if any while using on other devices. If possible could someone assist on this issue because I would like to know if were able to download the operating system by itself or should we include the kickstart within this upgrade.

Enter vrf (If no input, current vrf 'default' is considered):                                                    
Enter hostname for the tftp server: