How can I uninstall the droid turbo 2 nougat update I installed?

[Marina Overby]

I updated the newer version of the Droid Turbo 2 which would be the nougat onto my Droid Turbo 2 and it is running the battery down apps are not running correctly I just want to take it back out and put it back to the original marshmallow version

 

[doogald]

No, downgrades are not possible.