I appreciate that you’re just trying to help so thanks for your input.
I have done extensive modifications to this model in blender, it has many textures and many materials, some textures are alpha some are not, the textures are all available in folder and are of optimum size and packed. Some materials have no texture but all mesh has material. (you dont need texture but must have material)
The materials are of various shadings including Blinn and Cook Torrance, and some semi trans. I think I heard of an issue with Phong which is why I mention this.
Some surfaces are smooth some are flat.
The mesh is quite high poly count and the file size is big, BUT this model has been imported successfully before so size is not an issue, there must have been something I introduced in the last 5 mods that has caused this issue.
I am familiar with missing texture errors, tga errors, server errors, missing file errors, texture too big errors, inverted normals errors, non-manifold errors, and a host of others.
I have been importing models into hifi for over a year and every now and then I get this error, so once more from the top.
Do you know specifically what “Protocol Unknown” means please?