The standard solution is to format the internal flash and reload the firmware via a TFTP server.
Follow the prompts to set the server IP and local IP, then download the image. open boot device failed fortigate
Experts from the Fortinet Community note that using specific IP subnets like 192.168.1.x and naming the file exactly image.out can sometimes resolve stubborn TFTP connection issues. Critical Warnings & Known Issues The standard solution is to format the internal