hum...very strange.
If your chassis goes into reverse when you try to make it go forward, it should be a reverse of throttle control, this could be adjusted in the transmitter.
As for the chassis not moving forward or being jammed, then you could take the rear end a part using the tools we have provided with the RTR set. There should be a nut wrench where you could remove the rear wheel and you should be able to clean it.
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