Honda INSIGHT 2021 Owner's Manual page 288

uuAudio System Basic OperationuSystem Updates
286
5. Select Install Now or Install while
Vehicle OFF.
u A notification appears on the screen if
the update is successful.
1How to update
For the 12-volt 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.