Not having this device I can only go with what @AntiDroid said that there will be a way of reinstalling android if you wanted then retry the installer. You may also be able to install TWRP for your device then run the installer. One last thing I see the installer only lists the 771 not 712. Knowing how specific the installer is and not knowing anything about these tablets I would double check that is not an issue if yours is a 712.