Ask them for the code, don't let them do it for you because then they can charge you for it. Once you have it, press and hold scan and seek until 1000 comes up. Release the buttons. Use the radio preset buttons 1, 2, 3, 4, etc to change the 1st, 2nd, 3rd, 4th buttons until the code digits are correct. Press and hold scan and seek until safe appears. Release and the radio should be unlocked. If it gets messed up after a certain number of tries, you have to leave the radio on for 1 hour until you can input another code.
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