updating to jessie from wheezie

[helpman]

so I’m updating from wheezie to jessie and install 3.4…
from my old retropie it only updates to wheezie, so I guess I have to burn the image of the new 3.4 on the sd and install everything again. change output to pal, add every controller setup and the changes to a couple files so it recognises my juyao dual arcade controller… is there any way to just copy all the files over the new build without messing anything? any way to avoid doing it all again? if so, what folders should I copy over the new build?

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