1. First, find the "Pollen Club" option on your mobile phone and click Enter.

2. You can also open the browser directly on your computer and visit the Pollen Club.

3. Then, in the opened webpage, click the "Forum" button to switch to the forum page.

4. Then in the newly opened page, click the second top post, and then apply according to the registration.

5. It should be noted that not all mobile phones can apply for EMUI9. 1 system. At present, only P-series mobile phone users such as P 10 and P20, Glory 9, 10, note 10, mate20 can do it.

6. Even if the above models are met, if the mobile phone is already root, it cannot be upgraded. Moreover, application incompatibility may occur after the upgrade, so please be careful when upgrading.