Desperate Help Needed to install STOCK android

hi all,

i am totally new to the android world and i bought a cheap brandless phone to play around. However it runs only android 6 and i realized a number of apps do not run on it.
can someone be kind enough to guide how i can upgrade to the highest stock android possible?
I am not sure what details are needed .. here are a few :

Octa core
Build number

Much appreciated.

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