When an ota updates you phone it updates applications in the system apps one at a time, ota is not like a rom, when it updates the apps one at a time if one is missing it automatically errors out and aborts installation and if you have root in system app or bin it will error out because it is not suppose to be there, same with custom recovery not suppose to be there so it will error out, just sbf back to stock and update and then reroot with p3s root tool for Motorola phones, this is what I did and it went really smooth, no problems at all
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