how to adjust top speed of ebike motor

There are two ways to adjust the top speed of the ebike motor.
Way1: as the video shows just connect the two speed limit cable, then the top speed would be reduced to 50% of the original top speed.
Way1: turn on the display, go to the advance setting, the password is 1801, then go to the speed limit, the original value is 99. so revise it to be 20-30 around. try what top speed you can get. take 72V3000W motor for example, if you choose 25, it can get about 33km/h. if you want slower, make the value to be smaller.
Warning: be aware that please don't connect the two speed limit cable when you use the way 2 to adjust the speed. you can only choose one of the ways, you cannot combine them together.