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 ).
If you need a custom ROM phone, consider switching to a device with Snapdragon and unlockable bootloaders. Huawei Y7 2019 Custom Rom 2021
However, I need to give you a before proceeding: ⚠️ Important Reality Check The Huawei Y7 2019 has a Huawei Kirin 710 chipset. Because Huawei does not release full kernel sources or bootloader unlock codes for Kirin devices, there is no active custom ROM development for this model (as of 2021 or now). I understand you're looking for a custom ROM
Would you like a step-by-step guide for on your Y7 2019 instead? Huawei Y7 2019 Custom Rom 2021