@SanderK yes, there are a few ways. Look for an image that you downloaded with the emteria installer to C:\Users\%USERNAME%\AppData\Local\Emteria\Emteria.OS Installer\
In the image folder should be an config.json. Rename it to oem.json. Mount the boot partition on your local machine put the oem.json there. If that's not feasible, you can put the oem.json on a FAT32 formatted USB stick and have it connected during first boot.