I have seen how to unlock the theftlock radios before. I have seen the other posts( yes I searched first, rare I know ). But anyway when I hold down 2&3 nothing happens and if I try 1&4 still nothing. It is not a RDS stereo and the odd thing is this is also not a theftlock radio. But still I have LOC on the screen and can't do anytrhing about it. It is in my work van a 2005 Chevy Express. Thanks for any help.