I have done this multiple time all via windows....unlocked....rooted...downloaded zip from site for Nexus 9 specifically and moved root and booted up using TeamWin Recovery Console to install and after reboot just keeps looping. I have literally followed everything step by step on the site Preparing/Installing and same thing. This is my third go around and still fail. Like I said I followed everything step by step...MTP/Debugging/Wugfresh and everything in between as instructed. Any suggestions?