Unable to update system app I have been trying to update the system apps on my android phone, where in I get an error mentioning that the application which I'm downloading can't be installed. (Error code :- 104)

When I searched this problem on the internet, most solutions say "You have to root your cell phone and then try to update/install the respective application on your phone."

As I don't want to root my phone, is there any better solution to solve this problem instead of rooting my phone ?

And when I tried to install updated .apk file externally it shows error
Click on settings > backup and reset > factory reset then say yes to clean your phone.

If you try to factory reset your phone, this will do your phone automatically update your phone with initial version of your applications. 

Then try to update your respective built-in application from play store, it will solve your solution.