My mother's upgrading from a Huawei P9 to an iPhone she received as a gift (don't know which model it is).
She doesn't know how to use iOS and I'm finding it difficult to teach her, since I don't know how it works either, so I was wondering if it was possible to install some version of Android on it.
No Android and no custom launchers on iPhone, she'll have to learn using iOS, I think it's just a tad more of a fuss than moving to a different Android flavor, I'd try to look up some videos and materials about it to help her if I were you