I don't think Samsung will allow you to update firmware via anything except WiFi. I ran into the same issue when I got my S10. I have unlimited data so why would I care about using it to grab an update file, but no only over WiFi. I found a section in security I think that will allow you to update security patches via mobile data but not system updates. So I pictured a bunch of people without WiFi at home stopping into McDonald's to get their system updates... Seems silly to me. Warn me and allow me to proceed at my own risk.