Huawei Mate 9 and Mate 9 Pro are receiving the March 2020 security update with EMUI 220.127.116.11 from EMUI 18.104.22.168. On the other hand, Huawei P10 receiving this upgrade with EMUI 22.214.171.124 an upgrade from EMUI 126.96.36.199 (via Huawei Central).
Launched in 2016, Huawei Mate 9 series includes two smartphones – Huawei Mate 9 and Mate 9 Pro (also known as limited edition Porsche Design). And the Huawei Mate 9 series along with its 2017 P series partner – Huawei P10 still getting security patches in China including the latest – March 2020 EMUI security update.
According to the information, Huawei rolling out March 2020 security for Huawei Mate 9, Mate 9 Pro and P10 in China with the latest system improvements. The March 2020 EMUI security update includes Google security patches, fixing 2 critical and 20 high levels of Common Vulnerabilities and Exposures (CVE).
This is a good posture that the company is sending the security updates to these old flagships in China but it would be more praisable if the global users receive the same treatment in time.
Note: The update is rolling out in batches in China so it may take some time/days to reach your phone.