Your computer will not recognize the MediaPad X1 in "Download Mode" without specific drivers.
To understand the installation process, one must analyze the device's capability to run Lollipop.
2.1 Hardware Specifications
The jump from Android 4.2 to 5.0 introduced the Android Runtime (ART) as the default runtime environment, replacing Dalvik. While the 2GB RAM is sufficient for Lollipop, the proprietary nature of the HiSilicon chipset and the Vivante GPU presents significant driver compatibility challenges for open-source developers.
2.2 The Firmware Gap Huawei did not release a stable, global official build of Android 5.0 for the MediaPad X1 7.0. Consequently, users seeking this update cannot utilize standard OTA mechanisms or official Huawei HiSuite software. The installation of Lollipop requires the adoption of Custom ROMs—typically built from source code such as CyanogenMod 12 or 12.1 (now LineageOS). huawei mediapad x1 70 update lollipop install
Inside TWRP:
Only if:
Avoid if: