Paola, it will be strictly technical (we are in developer's corner
), sorry.
However... for non-techies I will prepare SD-card image with preconfigured software. This will be easy to flash and check. But still risky - be warned to always have copy of the working software!
I hope someone will make sure it is working ok with Mini and Aura HD as I cannot test it (I have Kobo Touch). It may not start without problems (changes have been made in kernel).