How will convert n-propylbromide into iso-propylbromide?

CH3-CH2-CH2-Br + KOH(alcoholic) = CH3-CH=CH2 + KCl + H2O
CH3-CH=CH2 + HBr = CH3-CH(Br)-CH3 Markonikov's rule
CH3-CH2-CH2-Br + KOH(alcoholic) = CH3-CH=CH2 + KCl + H2O
CH3-CH=CH2 + HBr = CH3-CH(Br)-CH3 Markonikov's rule