This guy explains it very nicely in this video.
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Both cards are genuine and we have registered them under your name for warranty purposes.
How do you register a card for warranty purposes? I have never done that
Are you sure you want to go to 2.0.5, I thought there was some talk that it only fixed a very obscure issue and could nobble the use of 3rd party batteries.
I have doubts because of this I found in the Canon support pages:
"Firmware Version 2.05 is for cameras with Firmware Version 2.0.3"
Sure then no risks going fro, 1.2.5 striaght to 2.0.5?
You better use that camera quick! I hear it's at the end of it's life cycle.