Will the app install after an Android update?

Question

Android

There is an ancient tablet, Samsung Tab 8.9.
There is a stock 4th Android. One application began to require an update, but it is not installed, it says that the device is not supported.
How likely is it or not that the application will install if you reflash the device to custom firmware for example 5 or 7 Android (aosp). Or do developers put restrictions on hardware?

Answer 1

The developer first of all puts a limit on the minimum version of the android API.
If before that the application worked, then it was required until the 19th.
I think now they have raised it to 21 (5.1) or even higher.
supporting 4-10% of the audience is not worth the increase in labor costs from 3 times.

Answer 2

Today one, tomorrow others will demand. Try to replace this application with an analog.