You have to keep the volume button when the program starts

Turn off the phone. Remove battery and hold it removed for 10 secods. Then place it back to the phne. Press and hold "Vol -" and "Power" buttons. Hold both buttons pressed till your phone completely hangs. This will enter to fastboot mode

Enter fastboot mode :

1 Connect your phone via USB to your computer and shut it down.
2 Then press and hold -volume(volume down) button.
3 Now while pressing the down button turn the phone on by pressing and holding the powerbutton, keep holding both of the keys something like 15sec,
4 If the "Huawei" logo stays and "gets stuck" you did it just correctly, now move to next chapter.
5 If your android started instead of getting stuck showing huawei logo you did something wrong, Go back to step 1.