I did this step… I am in the last step "Now it’s time to connect your phone. Remove the battery and connect the USB-cable while pressing the volume down button."
And as soon as i did this I got the message I mentioned above…
EDIT: I did it! I got my phone working!
Although I have the 1st edition I used the Fairphone_1.6_Cherry_FUSE_Image_2014-07-31 [for second batch] and it’s OK!