may i know what is the problem as i have 1 with me working fine,there are 2 version which can use with 2.4ghz and the normal..
km k8 / os speed / savox / blitz / contact tyre
km hk1 evo / os speed / savox / sweep
sworkz evo / spower evo s7 / sweep / savox
xray t3 2012 / tekin rs pro / reedy / savox
km racing / sworkz / xray / savox / sanwa / os speed / sweep / ulti / blitz