03-23-2019 06:28 AM - edited 03-23-2019 06:31 AM
Here is the plan:
It looks to me that you scrambled a couple of numbers / letters, but Tab4 8 Plus Tablet (TB-8704F, TB-8704X) should be getting last year's Oreo 8.1 upgrade. In my case there were several updates to Nougat 7.1.1 before Oreo 8.1, then there was a further large update in January. A couple of users from Germany seem to have had different upgrade experiences from North America.