A: The UPDATE.APP is corrupt, or you attempted to place a TWRP backup in the dload folder. Only signed Huawei UPDATE.APP files work.
Before updating or fixing the Huawei T1-701u firmware using an SD card, make sure to: Huawei T1-701u Firmware Sd Card
There are two primary ways to initiate the update from the SD card: : Power off the tablet completely. Insert the prepared SD card. A: The UPDATE