I made an account because I have this same bike and I came accross this thread. I'm trying to mod it as well.
I think the newer models come with a different controller. This setting might be to switch between 36v and 48v but I'm not sure.I have also p4 on my onebot. What is it?
I recently bought mine and was able to remove the speed limiter by doing the brake/throttle trick. You basically hold both brakes and twist the throttle to full speed, turn on the bike while doing this and hold it for about 5 seconds, then release the throttle and both brakes.I have found the white and black cable.
but The ebike go not faster.