I purchased my first electric bike (radrunner 2) the other day. I also purchased the upgraded display. My issue is that when I change the PAS mode I see no difference in either speed or power. From 0 to 1 the PAS starts fine and also from 1 to 2 i notice a difference. However, from 2 to 3 and 3 to 4 makes no difference. I therefore really struggle to get up even minor hills. I live on top of a fairly steep hill and unable to ride it up. I tried a reset which helped in that prior to the reset only mode 1 seemed to work.
Is your battery fully charged? I noticed mine gets like that when the battery is low.