On my 02 bravada the dash says unknown driver which the truck wont start what do

What is your question?

It says unknown driver it won't start please help me I think it's the security system how do I fix it it's an 2002 oldsmobile bravada

What makes this problem better or worse?

Nothing

How long has your 2002 Oldsmobile Bravada had this problem?

3 weeks