To install a custom ROM on a Huawei Y6 Prime (2018 or 2019 models), you must first navigate Huawei's strict bootloader restrictions. Since July 2018, Huawei has officially stopped providing bootloader unlock codes
Before any software modification, the bootloader must be unlocked. Since official channels are closed, your paper should focus on these alternative methods: huawei y6 prime custom rom
If you are looking for a custom ROM for the Huawei Y6 Prime, the short answer is: To install a custom ROM on a Huawei