https://www.androidsage.com/2019/08/01/download-huawei-p20-p20-pro-and-p20-lite-emui-9-1-based-on-android-9-pie-ota-updates/
Download Huawei P20, P20 Pro, and P20 Lite EMUI 9.1 based on Android 9 Pie OTA Updates