Burst-mode is not HDR. Burst-mode is a multi-shot of pictures in a row and hdr for high-dynamic-range-pictures. For getting a HDR picture without setting it, you need to point a subject with high contrast (house and sun/sky behind or portrait with sun/sky behind, inside rooms with light through windows etc.). When you use the "intelligence mode" for taking your picture, the camera analyzes the picture and choose them-self if it take a second picture in hdr-mode.
Phone: Huawei Ascend P6
OS: Android 4.2.2 with EmotionUI