Coming off 4.3 - I just loaded 4.4 with 1Ghz low voltage kernel and mine went into a boot loop too. Retried with the 1GHz med voltage kernel. Still boot loops. Wiped the data and cache three times and tried the low voltage kernel again. All is well now! It is amazing how resilient the Droid is, how hard it is to render it unusable, and how quickly you can restore it. Thanks Chevy! Great work on 4.4!