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I answer to myself after making more research. There is an pas and cad sensor in my bike and they need some adjust. Solution: Install Cycle analyst v3 system. With that you can do even much more. That should be the solution.

Hello! I found an problem after replacing bigger chainring to my RKS RSI-X foldable e-bike with 20x4 inch fat tires. Problem is that in the highest gear the electric assistance stalls. I think that after changing gear ratio the controller goes mad and does not understand the speed and cranking...

Hello! I have an RKS RSI-X bike and password in that bike is 6666. It has an S866 display and controller model: X032-AA003