"Radio Locked Please Start Vehicle"
If you are receiving this message, then you have either a Chrysler 200 or Jeep Cherokee.
These two vehicles use a Fiat based computer system and will on occasion need to have the vehicle programmed or "flashed" for the option code of the unit you purchased, either RA3(VP3) or RA4 (VP4).
This can be done at any Chrysler Dodge Jeep or Fiat dealership.
This is stated on the the product page under the Installation:
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The vehicle requires dealer programming. Please schedule an appointment at a Fiat-Chrysler dealership to have the vehicle programmed to accept the new radio.