my apologies for my bad english. I tried to install FortiOS 5.6 on Fortigate 80C.
Installation seems ok, but when fortigate reboots, he stays freezed and doesn't finish boot.
Try to re-flash the firmware via TFTP and boot menu.
I had the same thing with my 300d on 5.2.10 firmware
So I did firmware restore through serial cable to 5.2.10 (5.6 did not start too). I thing you should update your device to 5.4 first.
I updated my fortigate 80C to 5.4.1 then 5.4.4 and fished by 5.6. It wroked fine. thanks for help
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