Honda ACCORD HYBRID 2019 Owner's Manual page 287

5. Select Install Now or Install while
Vehicle OFF.
u A notification appears on the screen if
the update is successful.
uuAudio System Basic OperationuSystem Updates
1How to update
For battery protection, Install while vehicle OFF
cannot be selected when the battery is low on power.
If you want to install the updated data, recharge the
battery or select Install Now.
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