In simple terms, firmware is the operating system software that runs your hardware. While we often call it "Android," the firmware for a specific device includes the Android operating system, the Linux kernel tailored for that hardware, and proprietary software from Huawei (such as the EMUI interface and drivers for the camera, fingerprint sensor, and modem).
Huawei Mate 7 Repair Help: Learn How to Fix It Yourself. - iFixit
It sounds like you're looking for a (documentation, guide, or research material) regarding Huawei Mate 7 firmware .
For advanced users who want to flash individual partitions.
Modern apps (some require Android 7+), security patches, new features. Cons: No VoLTE, fingerprint sensor may break, random reboots, and a complex unlock + TWRP + root process.
Before touching any Huawei Mate 7 firmware, complete these steps:
Look for files like: MT7-L09_C900B571_Firmware_Android 6.0_EMUI 4.0_05022XKU.zip