Why does my phone keep telling me authentication error when I try to update it?

[AC Question]

why does my phone keep telling me authentication error when I try to update it

when I try to manually update my phone it keeps telling me authentication error

 

[B. Diddy]

Re: why does my phone keep telling me authentication error when I try to update it

Welcome to Android Central! Which phone? Manually update what--the system? Individual apps?