Furuno NX-700B Service Manual page 91

5. The updating of the program is automatically started. While the program is being
updated, nothing is displayed on the LCD.
6. When updating is complete, the normal display appears on the LCD.
The time for updating is 3 to 4 minutes.
7. Turn off NX-700B once and return the connection as it was.
6-5
6.2 Procedure for updating