I tried to put my code in twice not it will not let me try again. how do i get it back to asking for the code?

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My battery died, i got it jumped and I had to put my code in. i tried it twice. but now it will not ask me for the code. Just show off when I turn it off. When I turn it back on, it does not ask for the code so I cannot turn the radio on. How do I get it to ask for the code again?