While you can disable most of the voice notifications, you cannot disable the following notification for security purposes: “Regularly format the micro SD card for data integrity", "Parking mode report" (Except for F800 and pro).
While it can be bothersome, it is a security feature designed to let you know the recording status of the dashcam, to minimize build-up of bad blocks on the memory card, if any incidents occurred while parked and alert you of any potential errors that could prevent important footage from being saved securely.
Every few weeks or so, you will receive a notification "Format your memory card for data integrity". To get rid of the reminder, you will need to format the memory card. The notification is there as a reminder to format the memory card to minimize the buildup of bad blocks and to lengthen the longevity of the memory card.