The official B540 Android 6.0 Marshmallow update for the Russian Huawei Honor 4C (CHM-U01) is now available to download. This firmware features Android security patch level of June 1, 2016. Firmware Details Device: Huawei Honor 4C Model: CHM-U01 Android: v6.0 Marshmallow EMUI: 4.0 Firmware: B540 Build Number: CHM-U01C10B540 Custom Number: CUSTC10D001 Security Patch Level: June 1, 2016 Region: Europe Country: Russia Release Date: 19.07.2016 Status: Official (stable) Type: Full firmware image File name: Honor 4C_Firmware_CHM-U01_Android6.0_EMUI4.0_C10B540_Russian Federation_Channel-Others.zip Download Link: Official Mirror (Huawei Russia) | Size: 1.42 GB Installation Steps: This update requires your device to be running of the following firmware builds: » CHM-U01C10B530 » CHM-U01C10B502 » CHM-U01C10B320 Extract the firmware Zip package. Transfer “dload” folder to external microSD card. Unplug the USB cable and turn the device off. Now hold Vol up + Vol down + Power until your device begins to upgrade.