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hello welcome to just answer I am master tech and will be able to assist you on this.
since the code was forced into the system and locked out you will need to do a master reset.
to do this reset you will need to disconnect the battery and use a jumper wire or something to connect the batter ends together.
word of CAUTION place something over the battery like a piece of cardboard over the battery top.
main precaution is to keep the cable ends from touching the battery post or this will short the system out.
once you have taken this precaution then connect the lead and leave them connected for 20 minutes and it will allow the system to discharge the capacitors and basically wipe it clear and allow you to renter the radio codes.