Huawei EMUI is a custom mobile operating system that is based on Android that Huawei uses on most Huawei and Honor-branded smartphone devices.
Also, Android is based on a modified version of the Linux kernel and other open source software, and is designed primarily for touchscreen mobile devices such as smartphones and tablets.
Nup. Latest I heard is the US backed down on the ban on US firms selling tech to Huawei. So my guess is Android, but who knows. They might roll their own as a contingency plan as tensions are still high at present and maybe for the foreseeable future.
Huawei responds to Android ban
Huawei developed its own operating systems in case it’s banned from using Android and Windows
I read, it´s part java and part linux. It´s name is Hongmeng and have their own file system called Fangzou, and a app gallery.