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Now it's working, thanks a lot.

(I did previously format my card in camera, I just did it again, as I reinstalled the same firmware. Don't get why but it was needed to redo everything).

thanks again

I did!
I also watched the video 

I had the right firmware, yet I upgraded it again, I copied LM on a formatted card and so on.
Sorry I'm not lazy, I simply really don't get what I'm doing wrong.

Thanks now it says something like "file error, extract the battery and the card before trying again"

Hi!

I didn't find a similar subject in the forum:

My 5D II switches off while installing ML and I have to extract battery and card before being able to reanimate it.
I've tried twice and I'm scared to try again.

Any suggestions?

Thanks to all.