Homebrew How do I make a custom theme work?

[Mike9090]

I downloaded a custom theme from Themeplaza and I tried editing it to make it more personalized, and I have the image files changed and it's all cropped correctly but it doesn't change. I changed pt_top and pt_combined (I'm only editing top screen, and thus left the bottom screen of the pt_combined image the same too) but when I put my sd back in my 3ds and I select the theme it doesn't change.

 

[Mythical]

Make your own
https://gbatemp.net/threads/release-usagi-3ds-theme-editor-net-library-testers-wanted.412233/
https://gbatemp.net/threads/tutorial-creating-a-3ds-custom-theme-from-scratch-with-yata-v1-1.393602/