abisi1 , most likely 99% of the themed firmwares would be incompatible with your player. By using someone's themed firmware and flashing it in your player, high chance you will end up with a dead player.
What you can do is using S1fwx to extract your firmware and repair it. Then use S1res to edit the images that you can download from the themes section. Some of the themes that you find may be not suitable as tadad1 has mentioned, but you can still use it by manually editting the image files, either by MS Paint or some other image editors.
The full step-by-step instructions from extraction to theming is located
Here.