I rooted my 5.1.1 Build LMY47V version LS770Zv5 via Busy box SuperSu method. I un rooted and now would like to update to MM. I get the update download. Then I do the install, it runs does it thing. Restarts then proceeds to install but then gives me a dead droid. I reboot and all is OK. Am I missing something? Any help would be greatly appreciated.