Audio Systems: replaced alternator & battery-now radio shows loc, override code, radio code

Question
What code can I use to reset the radio on a 2000 Jimmy.  The alternator went out and the battery went dead.  After we replaced them the radio says loc.  We are not the original owner and do not have the code to restore.

Answer
Try this,
Press & hold the 2 & 3 buttons @ the same time for about 10 seconds; a 2 or 3 digit code will appear, write this # down,press & hold the am/fm button for about 10 seconds: another code will appear, write this # down, then call 1-407-9331065 they will give you the new radio code for a fee of $20.00 vehicle must be register  Write this code # down so you have it if you ever need it again. Enter this # into your radio following the instructions in your owners manual. If you get an override code that starts with 0, you drop the 0 when entering the code into your radio.
If you don't have an owners manual, try this, press & hold the hour button until the first 2 digits of your code come up, then press & hold the minute button until the last 2 digits show. Then press the am/fm button. This should reset your stereo