Today, Huawei announced Huawei EMUI 9.1 Beta recruitment of 8 models including Huawei Mate 9, P10 and Honor 9.
The new batch added to the EMUI 9.1 Open Beta Recruitment include:
It should be noted that the baseline version of nova 2s supporting beta is 22.214.171.124/126.96.36.199, and the baseline version of other models supporting beta is 188.8.131.52.
Huawei officially reminds that some third-party applications are not compatible with Android 9.0. Therefore, after the upgrade, third-party applications may not be able to be used normally (such as flashback, freeze, power consumption, etc.). It is recommended to try this in Huawei APP store and apply updates to the latest version.
In addition, users who sign up for the beta event ensure that the current mobile version is on the baseline version of the subscription. One can view the version number by going into Settings -> About view the version number information, if you are not currently on the baseline version, please upgrade to this version first.
Looks like it’s only Huawei which is providing updates even to 3 years old Mate 9, P10, Honor 10 with EMUI 9.1 based on Android 9.0.
Source (in Chinese)