Had the same problem my solution is during the reboot plug in the usb cable press volum down power to get into the motorola bootloader thingy (unsure what it called)
Then use fastboot on my computer to erase the update since for me the update ...
Man I finaly solve the repete reboot loop
Backgoud:I'm on a rooted phone and try the OTA update but since it's a modified system it failed however the phone keep rebooting for update and failed each time infinite loop
Solution while it reboo...
One question for those who already have it, can third party apps like poweramp, playerpro or rocket player scan a music folder in the SD card and integrate it into the music library?
I've read that with kk you need another app to access to that ...