$*$-isomorphism on $L(E)$

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Suppose $M_2$ be the set of all $2\times 2$ matrices and $L(M_2)$ be the set of all adjointable operators from $M_2$ to $M_2$.

Can you mention an example of$~~$$*-$isomorphism operator from $L(M_2)$ to $L(M_2)$? (not be identity map)