Look in the data.zip file. If you have a ui_igo9/480_272 folder it supports 480_272.
You could try this one. It supports only 480_272( no maps, buildings, or pois). If your data.zip contains the ui_igo9/480_272 folder, the problem could be in your sys.txt. You could try renaming it, so Primo uses only the default settings.