Work perfectly on my device Huawei ascend g510-200 B190:good:
I read the thread about rooting the G510 but the poster did say that there are multiple versions sold throughout the world and it was important to find what works for your specific phone.
I have scoured the net and I have found only one video of ...
I have X10 and face same problem until i found this great app
I got nice app called: Phone setting master
Hope that can help