Faking the Android version from a Samsung Galaxy Tab to counter Google's planned obsolescence policy

I've been used this mint Samsung Galaxy Tab S 8.4 purchased on eBay for a fraction of its price, more specifically, to listen YouTube videos on an Aiwa NSX-SZ80E system with a Bluetooth adapter added by good self, and everything worked just great. Too good to be true, I'd say. However, Google has unilaterally decided now to render this tablet obsolete overnight by disabling YouTube on it, and suggesting me to "switch to youtube.com" as shown: The question would be, **exactly how** can I edit my tablet's Android version number to **simply replace "6.0.1" with "9.0.0"**, effectively bypassing this Google's artificial obsolescence policy in the most elegant and straightforward manner possible? Any ideas will be greatly appreciated. If flashing the complete tablet with new, unstable, untested and unreliable firmware is required, I'll do it gladly, as long as it allows me to **bypass Google's policies of rendering my tablet useless overnight just because they can**.