Apparently, i accidentally solve my problem.
My problem was the custom recovery could't run at "Huawei Ascend" logo or no respond.
(1) Power on the phone and let it boot normally instead of Power up your phone while holding Power & - volume
(2) Run the custom recovery and press 1 and connect your USB cable.
(3) After the recovery is done, disconnect your USB cable and shut down the phone.
(4) Boot phone with Power & + volume (assuming you have already put in the new gapps)
And the remaining steps are the same.
Cheer to all those who helped me.
If anyone face similar problem, the above is the solution. thanks all.