Huawei Taiwan released new firmware B013 for Mediapad X1 7D-501L
Unfortunately there is nothing in the changelog. We suspect it should still be EMUI 2.3 with Android 4.4. Do flash it in and let us know what is different from other X1 firmwares.
台灣地區 x1 7D-501L_V100R002C324B013 升級軟體
You can download from here.
We have tested it by installing it over the Malaysia firmware. This new firmware updates the Mediapad X1 to EMUI 3.0 which gives it a very sleek look. Here is how it looks like