Build 15035 is widely regarded as the last truly stable, internally usable build of before Microsoft pulled the plug on active feature development. After this build, the mobile branch entered a "maintenance mode" state (Build 15254).

Windows 10 Build 15035 is an expired pre-release build from 2017. It is unstable, contains bugs, and is not suitable for daily use. This guide is for educational purposes and experimental use on unsupported ARM32 devices like the original Surface RT What is Windows 10 Build 15035?