Here ya go, try this.

Theft-lock Bypass

1. Press and hold presets 2 & 3 for about 10 seconds until the first 3
digits of the display code are displayed.

2. Write the numbers down.

3. Press the AM/FM button, write down the next 3 numbers.

4. Call 1-800-537-5140, when asked, enter 202107, press the # button and
enter the 6 digit code from the radio, you will get an unlock code, write
it down.

5. Go back to the car, press the HR button and set the first 2 numbers,
then press minute button and set the next two last numbers, press AM/FM
button, SEC should be displayed, turn on radio.

To remove customers code, repeat step 5. you should see --- on radio face,
the code is now out of the radio.

 

I don't know if you are asking me or not but the reciever I have is just the stock radio that comes in most silverados.