Orin nano hdmi problem

on our custom-designed carrier board, we modified the DP signals in the pinmux table to HDMI signals. However, there is no HDMI output after re-flashing the firmware.
Could you advise which critical steps we may have omitted for the above scenarios?

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please refer to p3509 board config in your BSP directory Linux_for_Tegra. That file has the HDMI change required.