Installing a custom ROM on the Huawei MatePad 10.4 is extremely difficult because Huawei officially stopped providing bootloader unlock codes in 2018. Without an unlocked bootloader, you cannot install a custom recovery (like TWRP) or flash a custom ROM. Current Status and Challenges Locked Bootloader
Before Googling "Huawei MatePad 10.4 custom ROM install zip," prepare the following: huawei matepad 104 custom rom install
Settings > About Tablet > Tap Build Number 7 times to enable Developer Options. Navigate to Developer Options and toggle USB Debugging.adb reboot bootloader.First boot may take 5–10 minutes.