We are using a Galaxy S6 device. The OS on the device is Android version 5.1.1. I don’t normally use the GearVR device. I just put the phone in GearVR developer mode. So I hacked around the problem just to verify that it could work by just forcing those textures types to be supported during the cook process and it successfully builds the package and we were able to run that on the device. So it seems like it is just a matter of figuring out how to tell Unreal that it’s OK to build ETC2 or ASTC texture formats for our project.