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regular point or a first-kind resonance of $H=\\Delta^2+V$, we first prove sharp $L^1\\to L^\\infty$ estimates for the solution operators: \\begin{align*} \\left\\|\\cos(t\\sqrt{H})P_{\\mathrm{ac}}(H)\\right\\|_{L^1\\to L^\\infty} + \\left\\|\\frac{\\sin(t\\sqrt{H})}{t\\sqrt{H}}P_{\\mathrm{ac}}(H)\\right\\|_{L^1\\to L^\\infty} \\lesssim 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