I would google XDA Developers. They have a solid list of all things you need to know about Odin and what is available for downloading.
Samsung customer service has confirmed to me that my note 8 is a US Sprint model. I'm outside the US. Is this why I'm not getting any updates?
Can anyone link any safe Oreo firmware to install for SM-N950UZKASPR?
I would keep in contact with Samsung. We wouldn't be able to help since it is not through our service.