Hi. Could you actually provide any details to the USB thumb drive you tried to install NomadBSD onto? And by the way, which specs did your PC/laptop have while you tried to install NomadBSD onto your USB stick?
Did you also consider following my noob-friendly guide for installing NomadBSD which you can find here? It goes into detail on how and where/on which USB drives to install NomadBSD onto. If not, I urge you you read and follow this guide while you install NomadBSD onto your USB stick.
Thank you.