i have same issue with my nexus 4. i have tried all what I got from various forums..Initially there was some issues with my battery, after replacing battery with a new one, and I downgraded from lolipop to kitkat....from then onwards I cannot go beyond the bouncing ball animation. I have tried erase and flashing all the .img files manually still no help. Then I donwloaded the android lolipop installation files and performed the same steps with the lolipop as well, still i cannot go past the animation

, Any help please, what to do next with my nexus ? Thanks in advance.