Huawei officially discontinued its bootloader unlock code service in 2018.
Because the Y5 2019 is a device, most "custom ROMs" for it are actually Generic System Images (GSIs) . 1. LineageOS (GSI Versions) custom rom for huawei y5 2019 top
Using the wrong files or a corrupted bootloader bypass can permanently "brick" your phone. custom rom for huawei y5 2019 top
Use tools like HiSuite to back up your data, as flashing will wipe the device. custom rom for huawei y5 2019 top
The Ultimate Guide to Custom ROMs for Huawei Y5 2019 (AMN-LX9)