Unhappy failed to upgrade kitkat and stuck at boot loader warning in moto g

hi,
I was trying to update KitKat to my GSM moto G by following these steps. http://www.android.gs/install-offici...o-g-all-models. unfortunately it failed with error 7 after 40%. I tried toggling signature and then repeat the steps but it failed again at 70%. Now I am unable to start my phone. It doesn't switch off as well. It keeps on and stuck on bootloader warning screen.

can anyone suggest me what to do? Can I go back to jelly bean? how?

thanks