@pranav @fosstodon @switchingsocial
Maybe take a look at the XDA-Thread of your tablet model and scroll trough the ROM section. I even found an Android Oreo ROM for my Xiaomi MiPad1 (not the most widespread tablet model).
Watch out in the ROM features for 'signature spoofing'. You can easily run MicroG with this, to be more independent from Google, if the Fdroid Store isn't enough for you or you relay an other Google Framework features to run certain app
One of the first Mastodon instances, there is no specific topic we're into, just enjoy your time!