Find your favourite image
You can use any photo or downloaded image as wallpaper. For best results, it should be 1920x1080 resolution for PS4, and 3860x2160 for PS4 Pro.
Copy it to a USB stick
Create a folder called IMAGES within the main directory of your USB stick and add as many images as you like. When you’re done, insert the USB stick into your PS4.
Open the image then right click and choose ‘Save image as’ to download them to your device.