If I recall correctly there's two images in the zip file, one "rommon" and one regular. Are you sure you chose the correct file and I'm assuming yous checked connectivity an authentication between the switch and the ftp/tftp server. I'd look at the ftp/tftp log, those probably hold the answer for you.
Article ID:4006 Configure Secure Shell (SSH) Server Authentication
Settings on a Switch Objective Secure Shell (SSH) is a protocol that
provides a secure remote connection to specific network devices. This
connection provides functionality that is similar...
Article ID:4982 Access an SMB Switch CLI using SSH or Telnet Objective
The Cisco Small Business Managed Switches can be remotely accessed and
configured through the Command Line Interface (CLI). Accessing the CLI
allows commands to be entered in a termina...
Article ID:5735 Convert Configuration Files using the Configuration
Migration Tool on Cisco Small Business Switches Introduction The Cisco
Configuration Migration Tool allows you to convert configuration files
from previous generation of Cisco Small Busin...