Huawei has updated both the 3G and 4G variants of MediaPad X1 (7D-501u/7D-503L) to stable Emotion UI 3.0 build, version B009, based on KitKat. This update addresses bugs present in the GPS, 4G network functionality, light sensor, and native Huawei apps & widgets. You can download this firmware as Update.app via the direct official links available below.
Huawei MediaPad X1 (7D-501u & 7D-503L) is getting updated to B008 Emotion UI 3.0 firmware based on Android 4.4.2 KitKat via OTA in China. This update is currently in developmental (beta) phase but you can still download the firmware for variant below and flash it manually.