There is no official EMUI 12 firmware file for manual installation (dload method) for this model. Fake files may brick your phone.
The Huawei Y9 Prime 2019 performs excellently on . It is stable, secure, and receives occasional security patches. huawei y9 prime 2019 emui 12 download
: Separated panels for easier access to connectivity toggles and alerts. There is no official EMUI 12 firmware file