Roboflow Starter Project for iOS - change model?

I’ve managed to get the Roboflow Starter Project for iOS up and running on my iPhone. It comes with the roboflow-mask-wearing-ios model. I tried changing it to the playing-cards-ow27d model by updating the API key, the model name, and model version, and I get the following error:

Failed to parse the model specification. Error: Field number 7 has wireType 4, which is not supported.
Optional("Failed to parse the model specification. Error: Field number 7 has wireType 4, which is not supported.")
No Model Found. Trying Again.
Error Loading Model. Check your API_KEY, project name, and version along with your network connection.

What am I doing wrong?

I was able to use a different model, playing-cards-n7nhw/1. Still not sure why the other model doesn’t work.

The iOS SDK only works with Roboflow 3.0 models.

Where in Universe does it say what version of the model it is? Is there a way to filter by that? Why is the iOS SDK limited to 3.0?

Actually, I found that the playing-cards-ow27d/4 model doesn’t work on iOS, but the playing-cards-ow27d/2 does, and that’s Roboflow 2.