Hi there and welcome to the forum!
I have found the mr03ve board is pickier at establishing a connection with a transmitter compared to a regular mr03 board. Keeping the car and transmitter a few feet apart when powering on helps. If the connection doesn't work after a few seconds I turn the power to the car on and off again and generally it connects instantly - I rarely have to do this though.
Try having the car and transmitter further apart when powering on and let us know if it helps.
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