custom ROM Huawei MatePad 10.4 is extremely difficult because Huawei stopped officially providing bootloader unlock codes in 2018. Without an unlocked bootloader, you cannot install custom recovery (like TWRP) or custom ROMs (like LineageOS). Current State of Custom ROMs Bootloader Limitation

Step 2: Fastboot Flashing Once unlocked, reboot to fastboot. Using the provided flash_all.sh script, the ROM repartitions the system volume to 4GB to accommodate GApps. The script installs:

White Paper: The Custom ROM Landscape of the Huawei MatePad 10.4

Subject: Feasibility, Limitations, and "Exclusive" Development Status Device Variants: BAH-AL00, BAH-L09, BAH2-W09, MatePad 10.4 (2022)

Thus, exclusive here means: only a tiny user base can run these ROMs, and development is kept within private Telegram groups or Chinese forums (Coolapk, 51RUAN).

Why so few?

• Bootloader Hell: Huawei stopped providing unlock codes in 2018. You cannot run fastboot oem unlock. You need exploits or paid services (DC-Unlocker, SigmaKey) costing $20–$40.
• Kernel Source: Huawei rarely releases complete kernel sources for tablet SoCs, making ROM building a reverse-engineering nightmare.
• HarmonyOS Lock-in: Newer units run HarmonyOS 3/4, which is closed-source and incompatible with AOSP-based ROMs.

Performance and Battery Life