It is quite simple to change the door logo with you own design.

Only 1 rule: You must save the changed file in the same format it was originally, and you must maintain the picture size. Otherwise it will not show, and/or give you errors in the log.

I recommend using Paint.Net or Photoshop or Gimp. Alternatively Inkscape for vector drawings.

1. Unpack the zip to a temp folder, or extract the file.
2. Delete the existing drawing with the erasor tool, or whatever method you prefer.
3. Draw your new logo, or copy and paste PNG format from another source. 
4. Save the logo file.
5. Repack the zip package (or add/overwrite the in the package)
6. Done.

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