Upgrading Comfort II Flash firmware by UCM Programming Cable

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No, your UCM needs to be upgraded to the latest firmware which allows it to be used to upgrade Comfort, Slaves and other UCMs. At present this requires another UCM to upgrade a UCM, ie a UCM cannot upgrade itself. You can look for a  friend who has a UCM with firmware at least 5.178 so you can upgrade each others UCM, or ask a the distributor who sold the UCM is they can do it

The new UCM firmware 6.xxx can upgrade itself without using the Programming cable. You need another UCM to do the initial upgrade to firmware version 6 but once this is done, the UCM can be self upgrading