my neighbor got an old Samsung Tablet with Android 4.1.X, he primarily wants to use it for watching YouTube. Now, the problem is, the YouTube-App needs to be upgraded, but the Play Store says the device is not compatible. I have tried to just load YouTube in the browser, but the page just doesn't seem to load. Any ideas on how to get that running? Thanks in advance!
Android 4.1 is super old, so getting anything still updated to run on it could be complicated. And because of that, I have maybe two or so ideas, but I can't ensure their viability. First, to replace the phone's Android system for a newer one. Second, to try to use a custom player, like Revanced or Grayjay. And as an extension of the second idea, if no programs you can find work, to try to manually compile them against the latest API version that supports Android 4.1.
Make sure that all system dependencies such as Google play services are running the latest compatible version -> https://m.apkpure.com/google-play-services/com.google.android.gms (most likely you'll have to go to "old versions -> show all" and then try one version per year until you can narrow it down to something that works).
Current NewPipe and forks are also minimum Lollipop.
Of course Revanced (as in the manager) is minimum Oreo as is the YouTube app that I vanced with it.