Samsung Galaxy Tab 8.9 launched March 2011. The device got a lot of attention from the public for its 8.9 screen-inch sizes. It came out of the box with Android 3.0 Honeycomb and later received the final 4.0 ice cream sandwich build. Galaxy Tab 8.9 won’t receive the Android 7.1.2 Nougat officially, though now you can enjoy the unofficial AOSP Android 7.1.2 Nougat on Galaxy Tab 8.9. Don’t expect an official Android update anytime in future. But you can really taste the pure Android 7.1.2 Nougat experience with this Custom ROM. Download and enjoy the AOSP Android 7.1.2 Nougat on Samsung Galaxy Tab 8.9.
AOSP stands for Android Open Source Project which is source tree which released by Google to the developer to work on Android OS. Thanks to XDA Senior member – developer decatf for bringing the beta Android 7.1.2 Nougat ROM for Google Galaxy Tab 8.9 (GT-P7310/P7300).

Download and Install AOSP Android 7.1.2 Nougat on Galaxy Tab 8.9
This ROM is still under development and has some bugs which need to be squashed. You can give a try and enjoy the AOSP Android 7.1.2 Nougat on Galaxy Tab 8.9.
Hi,
can we download and isntall 4 firmware or just one
in this adress https://forum.xda-developers.com/devdb/project/?id=17225#downloads