Probably Primary Meru image is corrupted, please upgrade!!

[ok1311]

My FortiGate U431F is stuck in a loop in Putty after startup, with the message 'Probably Primary Meru image is corrupted, please upgrade!!' appearing during the process. However, even after entering the code 'fap22b1！$', it still doesn't stop. If I don't unplug the power, the code won't stop.

What should I do? Please help me, thank you!

[AEK]

Did you try to install a new firmware.

Connect your laptop to FortiAP with serial cable, then boot the AP, go to the menu and install firmware.

As far as I remember the firmware installation was via TFTP through Ethernet connection with laptop.

[ok1311]

Yes, but I can't get it to stop and let me update the firmware

[AEK]

You need to power it off and power-on again, then catch the menu before it tries to boot.

[ok1311]

Latest update: I have finally entered U-boot, but why do I keep setting the wrong IP address? I have turned off the firewall and released port 69, but I have been unable to ping U431F. Of course, use 3CDaemon or extraPUTTY software cannot be used to transfer firmware to it too...

Did I do something wrong? Can someone tell me? What should I do next?