Huawei ascend g525 4.1.2 to 4.4.4.

Can anyone help me with the steps to upgrade huawei ascend g525 4.1.2 to 4.4.4.
I'm a beginner in this and I don't have any idea. Please let me know the things and application for upgarading to 4.4.4.
Appreciate if anyone can refer to youtube video.