After about a month of beta testing in China, Huawei is rolling out the Android 9 Pie-based EMUI 9 update to older flagships such as the Mate 9 series including the Mate 9, Mate 9 Pro, and Mate 9 Porsche Design. All these phones launched in 2016 with EMUI 5.0 based on Android 7 Nougat. The Mate 9 series aside, Huawei is also releasing EMUI 9 to the Novs 2S.
Huawei started rolling out Android Pie to the Mate 10 and P20 series last December alongside the Honor 10. At that time, we learnt that the Mate 9 and P10 series are expected to get onboard the latest Android update by March this year. Looks like Huawei is sticking to its timelines, which is commendable.
The Mate 9 series got updated to Android 8 Oreo-based EMUI 8.0 in 2017 and now they will soon be getting the taste of Android Pie. Meanwhile, Huawei's sub-brand Honor is also sending out Pie updates to the Honor V9 and Honor 9.
EMUI 9.0 brings new features such as improved system performance, a more fluent operation, and reduced app startup times. EMUI 9.0 features GPU Turbo 2.0 that should help make gaming more hassle-free. Huawei also offers its own Digital Balance feature on top of Google's Digital Wellbeing in Android Pie.
Source(s)
Mydrivers (Chinese)