Huawei officially stopped providing bootloader unlock codes in 2018. Without an unlocked bootloader, you cannot flash a custom recovery like TWRP or a custom ROM. Proprietary Kirin Chipset: HiSilicon Kirin 925
A custom ROM installation on the Kirin-based Mate 7 is not as straightforward as on a Snapdragon device. Huawei uses a proprietary bootloader unlocking process that is now officially blocked. Huawei Mate 7 Custom Rom -
Here's a general outline of the custom ROM installation process: Huawei Mate 7 Custom Rom -
A custom ROM transforms the Mate 7 from an e-waste candidate to a usable secondary device —perfect for music streaming, e-reading, GPS navigation, or as a dedicated dashcam. For a primary phone, upgrade hardware. But for nostalgia and sustainability, LineageOS 14.1 makes the Mate 7 fight another day. Huawei Mate 7 Custom Rom -