I bought another one of these for my 2nd kid used like new, and it really does look like new.  I have another exact same model that I had no problem updating to Android 8.1.0.  I have tried everything I can think of to try and get this new one to update but it always says its on the latest version.  I have tried factory resets from recovery boot, clearing cache, tried running internet from my phone hotspot etc.  I saw another post mentioning the last letters in the build, they are both ROW.  I want to know if I am missing something before I return it.  Right now it cant install netflix and many other games he is used to having I assume because of the old version.  If there is anything else that you think I can try I'm up for trying it, otherwise I am returning it.  Thanks

I can confirm going through the Lenovo Moto Smart Assistant and flashing the rescue image fixed it.  Sorry for the premature post, hopefully this will help others.  Thank you AdamW75 and https://forums.lenovo.com/t5/Lenovo-Android-based-Tablets-and-Phablets/No-Oreo-Update-for-Tab-4-8/m-p/4432049?page=1#4558900

yes its fine now thanks.

i also find this error i don't know why.