: Huawei officially stopped providing bootloader unlock codes in 2018. Without an unlocked bootloader, you cannot flash a custom recovery (TWRP) or a custom ROM.
Since the tablet lacks native Google Mobile Services (GMS), use these stable alternatives: huawei matepad 104 custom rom 2021
A unique 2021 development was a custom update.app file that bypassed the bootloader unlock entirely. This was a Frankenstein ROM combining AOSP frameworks with Kirin drivers. While risky, it was the only option for users who updated to HarmonyOS and lost the ability to unlock the bootloader. huawei matepad 104 custom rom 2021