Problem solved, don t know how
At some point when I connected the reader to the computer, I had a screen (on the device) asking me if i wanted to format the internal memory by pressing the "bookmark"-button. Which I did and it finally worked. Everything was erased and my "invalid format"-problem too.
Don t know how that happened.
Hope I will nnot have the same problem again.
Thank you very much for your help anyway.
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