Huawei has officially released the B310 Android 4.4.2 KitKat update for the Honor 3C (H30-U10) based on Emotion UI 3.0 in Pakistan. This update is being rolled out via OTA but you can also download the full firmware package via the direct download link provided below.
Download Honor 3C B310 Android 4.4.2 KitKat Firmware [EMUI 3.0] [Leak]
Here is the B310 KitKat update for Huawei Honor 3C based on Emotion UI 3.0. This is a leaked firmware (not official) intended for Middle Eastern countries. You can download this update below.