Samsung S4 Errors

[PoweringGravity]

So im posting this, because my Samsung S4 doesn't even want to show the homescreen when I unlock it. I was trying to change the resolution because I'm stupid and wanted to get a better gaming experience on graphically demanding games such as MKX. Now I'm stuck with the homescreen not loading and Im not sure If a reset will work. Any help?

 

[ak47jar3d]

A reset should fix that issue.

 

[PoweringGravity]

A reset should fix that issue.

I reseted but Google play won't let me login to download apps

 

[ak47jar3d]

What exactly happens? Can't login to Gmail?