im also having same issues of bootloop after flashing 5.0 factory image to 4.4.4, tried many times and with many different ways but still same.
i remember few days back i was on the older nexus root toolkit and that time it had upgraded and was working also but i went back to 4.4.4 because root wasnt working on 5.0 at that time so i guess its something to do with the toolkit thats causing the bootloop
---------- Post added at 11:14 AM ---------- Previous post was at 11:03 AM ----------
the older version on which it worked was i think 1.9.3 or 1.9.4
there is nothing "in the toolkit that is causing a bootloop" - the flash stock procedure is standardized. Have your tried factory reseting? Have you tried enabling "post-flash factory reset"?
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