1997 monte carlo stereo lockout?

Diverse goon

New member
I just got this piece of fine engineering and I needed to disconnect my car battery. When I reconnected it my factory stereo displays LOC and now cant play music.

I've tried holding down 2&3 together with no luck and I don't want to have to go to the chevy dealer.

Is their any way I can unlock this thing?
 
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