Cant root Samsung Galaxy Ace 2 (GT-i8160)

Hi,

Im trying to root my Galaxy Ace 2, I have followed the steps from here -

but the problems is I can only get to step 3, because when I boot the phone into Recovery Mode it just sits at the screen which says:
Downloading....
Do not turn off target!!

I copied update_su.zip to the root of the internal SD card, Im assuming for some reason its not picking up the file is there?
Is it safe to put the update_su.zip file on the micro SD card and update this way?

Thanks in advance

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