mobile

guys i m in a big trouble...pls help....i was pissed off with lollipop update and wanted to roll back to android kitkat. Thus, i root the nexus 5 and installed android kitkat thru adb. But after that the phone is stuck on the screen showing 4 different color bars. and its not coming to the fresh installation screen. can someone pls help. What i may have done wrong. Or how to get around it....