1997 Nissan Altima how to remove the factory radio

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The radio is attached to the trim plate by several screws installed from the rear

Disconnect the negative battery cable.
Remove the dashboard trim panel that surrounds the radio.
Remove the four screws securing the radio.
Carefully pull the radio from the dashboard.
Label and disconnect the electrical harnesses and antenna wire.
Remove the radio from the vehicle.

To install:

Connect the electrical harnesses and antenna wire.
Carefully position the radio in the dashboard.
Install the four radio attaching screws and tighten securely.
Install the trim panel that surrounds the radio.
Connect the negative battery cable.