Some Chinese firmware versions (B011) may not come with the Google Play Store. You may need to sideload the Google Services Framework or use the Huawei AppGallery to find an installer.
Follow these steps carefully. Do not skip any. huawei mediapad x1 70 update lollipop install
Also download for Android 5.1 – ARM – pico (to save space). Some Chinese firmware versions (B011) may not come