Because the BG2-U01 is now over a decade old, it is considered a "legacy device" in the Android development community.
This is the primary hurdle. Huawei officially stopped providing bootloader unlock codes in 2018. You may need to use third-party paid services (like DC-Unlocker or Ministry of Solutions) or software exploits if they exist for the MT8127 chipset. Custom Recovery (TWRP): huawei bg2-u01 custom rom
: The most active discussions for this specific model, including experimental builds or specialized debloated stock ROMs, are found on forums like 4PDA . Summary of Specifications (BG2-U01) Because the BG2-U01 is now over a decade