In the meantime, I looked at the ABOUT page and it looks like my box already came with that firmware. At least the date is the same.
In my case, I can install apps via the Play Store app. The trouble is that there are many apps which say "Incompatible with your device" and don't show the "Install" button. Is this the same with the rest of you? Maybe it means that many apps are not marked as compatible with Android 9.0 and thus they don't have the option to install? Personally I doubt that this is the case because stuff like, e.g. Youtube, will also not install via Play Store. But there are other apps which have no problem.
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