1. Download UnityAssetBundler
2. Open PP1_Data/resources.assets
3. Change the images
4. Save the new resources.assets
More in different sections

1. Go to https://forums.7daystodie.com/forum/-7-days-to-die-pc/game-modification/tools/23262-unity-assets-bundle-extractor?22675-Unity-Assets-Bundle-Extractor=
2. Download UnityAssetBundler, use the correct version (32 or 64 bit)
3. Unzip the file
4. Open AssetBundleExtractor.exe
(if the file was removed on the forum, send me a message. I can re upload the zip file)

1. Resize the images you want to 793x1080 px
2. Convert the images to .png files if they aren't already
3. Open *\PP1_Data\resources.assets in UnityAssetBundler with File>Open
The Path IDs 1-100 will be type:"Textures". These 100 files are the images.
4. Choose one of the 100 images and use Plugins>"export to .png" to see what image it is
5. If you want to change this image, use Plugins>edit>Texture>Load and load the image, click ok.
6. Change however many images you want to change
7. File>Save and save it as "resourcesNEW.assets"
8. Close UnityAssetBundler
9. Rename "resources.assets" to "resourcesOLD.assets"
10. Rename "resourcesNEW.assets" to "resources.assets"

You can now open the game and your custom images will be there.