To answer my question it is the mod_0.pak inside data/packs folder. I replaced the v0.1 mod_0.pak with original RTRPE2.0 mod_0.pak and my unit pictures came back. I noticed this because v0.1 .pak file is 2800kb while the original RTRPE2.0 .pak file is around 30,000kb. Maybe a mistake something left out?