Because the MediaPad T1 8.0 uses older hardware, options are more limited than modern devices.
You must install a recovery like TWRP (Team Win Recovery Project) or CWM (ClockworkMod) to flash ROM files. huawei mediapad t1 8.0 custom rom
Once unlocked, flash your recovery image using: fastboot flash recovery recovery.img . Because the MediaPad T1 8