I understand you're looking for a custom ROM guide for the (also known as Huawei Y7 Prime 2019 , codename DUB-LX or DUB-AL00 ).
Users on 4PDA have successfully ported cameras and custom MIUI based on Android 9.0. Prerequisites for Installation Unlocked Bootloader: (Must have the unlock code). ADB & Fastboot Drivers: Installed on your computer. TWRP Recovery: Huawei Y7 2019 Custom Rom 2021
Unlocking the bootloader is the first and most critical step for any custom ROM installation. I understand you're looking for a custom ROM
Before flashing, check XDA’s “Huawei Y7 2019 Guides” thread for the latest unlock exploit. The scene changes weekly. Huawei Y7 2019 Custom Rom 2021