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Remove the lower glove box (see PASSENGER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION ).
Remove the mounting bolts (A), and loosen the bolt (B).

Fig 1: Mounting Bolts With Torque Specifications
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Disconnect the connectors (C) from the adapter unit (D).
Remove the adapter unit from the bracket.
Install the USB adapter unit in the reverse order of removal.