If you cant get root by pressing the root button you need to either do a readback and create cwm (this gives you also a backup) or try rooting with a oneclick tool like root genius or similar and try again.
i havent tried it yet, but i plan to do this as first video on my new channel. MTK droid tools stopped developing with version 2.5.3 and the release of the new chipset. But miracle box has a new tool:
this should also work with just a usb cable (but...