Hutchyxr6

Just a question regarding j3 chip. I bought one for my ef 6 cylinder and was all good but realised rev limiter was set past 6800 so I took it out as someone was goin to change it. Now my chip won't work again. When I turn Ignition on thermos come on an car just cranks over. Have tried different ecu's and also another j3 that my mate had in one of his old falcons. Stuck on what the problem is. Any advice would be appreciated. Cheers