So, as I understand it, it is possible to upgrade the software “in the field” which is very cool and very 2017. So, it may take 2 weeks for the tablet to arrive anyway. Why don’t you go ahead and ship them and simply issue a hotfix when you have it stabilized? My computer does it, my phone does it, my Kindle does it. That is the great thing about software development in this day and age: the constant release cycle.