u/Pleasant-Apricot-620

I was just gifted a kindle fire HD 8 (8th generation) and based on what I can seem to find it seems to have a custom ROM installed. There’s no Amazon AppStore or the preloaded apps. It says it’s running android version 7.1.2, and several factory resets have done nothing.
The problem is the person that gifted it to me didn’t mess with it, and I didn’t, and every answer I found on the internet said you have to know what was changed to be able to put it back.
How can I fix this?

I was just gifted a kindle fire HD 8 (8th generation) and based on what I can seem to find it seems to have a custom ROM installed. There’s no Amazon AppStore or the preloaded apps. It says it’s running android version 7.1.2, and several factory resets have done nothing.
The problem is the person that gifted it to me didn’t mess with it, and I didn’t, and every answer I found on the internet said you have to know what was changed to be able to put it back.
How can I fix this?