Installing a custom ROM on the Huawei Y9 Prime (2019) is a complex process due to Huawei's strict bootloader policies
💡 Check the XDA Developers forum or Telegram support groups specifically for "Huawei Kirin 710 GSI" to find the most stable builds for this week. To help you find the right files, let me know: Do you already have an unlocked bootloader ? What is your current EMUI version ? huawei y9 prime custom rom
Use a 16-digit code via ADB/Fastboot commands ( fastboot oem unlock ). Installing a custom ROM on the Huawei Y9