Huawei no longer supplies the code needed to unlock your bootloader, which is the first essential step for a custom ROM. You may need to use third-party paid services or specialized tools like DC-Unlocker to obtain a code. Tom's Guide Forum Step 1: Preparation Backup Data:
Most custom ROMs for this device are "debloated," meaning they remove the heavy background processes that slow down the tablet. Huawei T1-701u Custom Rom