Here is the official B340 Android 6.0 Marshmallow update for the Asian Huawei Mate S (CRR-UL00) variant available to download.
Download Huawei Mate S B355 Marshmallow Update [UL00/L13/UL20] [Middle East]
The final Android 6.0 Marshmallow firmware build is now available for Huawei Mate S (CRR-UL00, CRR-L13 & CRR-UL20) in Middle Eastern countries. You can download the full firmware package as Update.app for the aforementioned variants below.
Download Huawei Mate S (L13) B115 Lollipop Firmware [Asia Pacific]
Huawei has officially outed the stock C470B115 Android 5.1 Lollipop firmware of its Mate S (CRR-L13) flagship for Asian Pacific countries. You can download this firmware as full Update.app package below.